Michael Anthony Harper

US Patent:

51326027, Jul 21, 1992

Filed:

Oct 2, 1990

Appl. No.:

7/594859

Inventors:

Gary C. Jorgensen - Phoenix AZ
Michael D. Harper - Phoenix AZ

Assignee:

Calsonic International, Inc. - Irvine CA

International Classification:

G05B 102

US Classification:

318608

Abstract:

A method and apparatus for accurately and reliably positioning an actuator arm (12) is disclosed. The actuator arm (12) is driven by a conventional DC motor (38). The conductors which supply current to the motor (38) serve as primary windings (60) of a current transformer (58). The signal induced on secondary windings (62) of the transformer (58) responds to fluctuations in average current flowing in the motor (38). These fluctuations are amplified (64) and filtered (66) so that an AC burst (68) is produced in response to each commutation of the motor (38). The AC burst (68) triggers a one-shot timing circuit (72), which generates a pulse that remains active until the AC burst (68) has decayed. The pulse disappears prior to a subsequent commutation of the motor (38). Thus, one pulse is generated for each commutation of motor (38).

US Patent:

20210362297, Nov 25, 2021

Filed:

Jun 23, 2021

Appl. No.:

17/304604

Inventors:

- St. Paul MN, US
Maiken Givot - St. Paul MN, US
Malte Korten - Moorenweis, DE
Robert L.W. Smithson - Mahtomedi MN, US
Brian D. Goers - Minneapolis MN, US
Negus B. Adefris - St. Paul MN, US
Thomas J. Anderson - Cottage Grove MN, US
Brian A. Shukla - Woodbury MN, US
Michael C. Harper - Hudson WI, US
Elizaveta Y. Plotnikov - St. Paul MN, US

International Classification:

B24D 3/06
B24D 3/14
B24D 5/10
B24D 7/10
B33Y 80/00
B33Y 10/00
B33Y 70/00
B29C 64/153
B24D 18/00
B22F 10/10
B22F 10/00

Abstract:

The present disclosure provides methods of making a vitreous bond abrasive article and a metal bond abrasive article. The methods include sequential steps. Step a) includes a subprocess including sequentially: i) depositing a layer of loose powder particles in a confined region; and ii) selectively applying heat via conduction or irradiation, to heat treat an area of the layer of loose powder particles. The loose powder particles include abrasive particles and organic compound particles, as well as vitreous bond precursor particles or metal particles. The layer of loose powder particles has substantially uniform thickness. Step b) includes independently carrying out step a) a number of times to generate an abrasive article preform comprising the bonded powder particles and remaining loose powder particles. Step c) includes separating remaining loose powder particles from the abrasive article preform. Step d) includes heating the abrasive article preform to provide the vitreous bond abrasive article comprising the abrasive particles retained in a vitreous bond material, or to provide the metal bond abrasive article. A method of making a metal bond abrasive optionally includes infusing an abrasive article preform with a molten lower melting metal and solidifying the molten lower melting metal to provide the metal bond abrasive article. The present disclosure further provides a vitreous bond abrasive article precursor and a metal bond abrasive article precursor. Also, methods including receiving, by a manufacturing device having a processor, a digital object specifying data for an abrasive article, and generating the abrasive article with the manufacturing device.

US Patent:

20210316503, Oct 14, 2021

Filed:

Jun 23, 2021

Appl. No.:

17/304596

Inventors:

- St. Paul MN, US
Maiken Givot - St. Paul MN, US
Malte Korten - Moorenweis, DE
Robert L.W. Smithson - Mahtomedi MN, US
Brian D. Goers - Minneapolis MN, US
Negus B. Adefris - St. Paul MN, US
Thomas J. Anderson - Cottage Grove MN, US
Brian A. Shukla - Woodbury MN, US
Michael C. Harper - Hudson WI, US
Elizaveta Y. Plotnikov - St. Paul MN, US

International Classification:

B29C 64/153
B24D 3/06
B24D 3/14
B24D 5/10
B24D 18/00
B24D 7/10
B24D 5/06
B22F 12/00
B29C 64/393

Abstract:

The present disclosure provides methods of making a vitreous bond abrasive article and a metal bond abrasive article. The methods include sequential steps. Step a) includes a subprocess including sequentially: i) depositing a layer of loose powder particles in a confined region; and ii) selectively applying heat via conduction or irradiation, to heat treat an area of the layer of loose powder particles. The loose powder particles include abrasive particles and organic compound particles, as well as vitreous bond precursor particles or metal particles. The layer of loose powder particles has substantially uniform thickness. Step b) includes independently carrying out step a) a number of times to generate an abrasive article preform comprising the bonded powder particles and remaining loose powder particles. Step c) includes separating remaining loose powder particles from the abrasive article preform. Step d) includes heating the abrasive article preform to provide the vitreous bond abrasive article comprising the abrasive particles retained in a vitreous bond material, or to provide the metal bond abrasive article. A method of making a metal bond abrasive optionally includes infusing an abrasive article preform with a molten lower melting metal and solidifying the molten lower melting metal to provide the metal bond abrasive article. The present disclosure further provides a vitreous bond abrasive article precursor and a metal bond abrasive article precursor. Also, methods including receiving, by a manufacturing device having a processor, a digital object specifying data for an abrasive article, and generating the abrasive article with the manufacturing device.

US Patent:

20210245433, Aug 12, 2021

Filed:

Jun 27, 2019

Appl. No.:

16/973150

Inventors:

- St. Paul MN, US
Jens Eichler - Kaarst, DE
Tilo Remhof - Hilden, DE
Brian D. Goers - Minneapolis MN, US
Brian A. Shukla - Maplewood MN, US
Alexander J. Kugel - Woodbury MN, US
Maiken Givot - St. Paul MN, US
Michael C. Harper - Hudson WI, US

International Classification:

B29C 64/245
C08K 3/22
C08K 3/04
C08L 75/06
B29C 64/153
B28B 1/00
B33Y 10/00
B33Y 70/10

Abstract:

An additive layer manufacturing method, preferably using selective laser sintering, for manufacturing a solid article, the method including applying a layer of a powder, the powder including at least one powdered (co)polymer, onto a solid substrate in a processing chamber; fusing the powder layer onto the solid substrate; subsequently depositing successive layers of the powder, wherein each successive layer is selectively fused prior to deposition of the subsequent layer of powder so as to form the article. In some embodiments, the powder further includes abrasive particles having a hardness greater than or equal to that of aluminum oxide.

US Patent:

20210094149, Apr 1, 2021

Filed:

Dec 11, 2020

Appl. No.:

17/247442

Inventors:

- St. Paul MN, US
Brian D. Goers - Minneapolis MN, US
Robert L.W. Smithson - Mahtomedi MN, US
Negus B. Adefris - St. Paul MN, US
Brian A. Shukla - Woodbury MN, US
Michael C. Harper - Hudson WI, US
Elizaveta Y. Plotnikov - St. Paul MN, US

International Classification:

B24D 3/06
B24D 18/00
A61C 3/02
B33Y 10/00
B22F 3/00
B24B 1/04
B24D 3/28

Abstract:

Methods of making metal bond abrasive articles via powder bed jetting are disclosed. Metal bond abrasive articles prepared by the method include abrasive articles having arcuate or tortuous cooling channels, abrasive segments, abrasive wheels, and rotary dental tools.

US Patent:

20200070311, Mar 5, 2020

Filed:

Dec 13, 2017

Appl. No.:

16/467132

Inventors:

- St. Paul MN, US
Brian D. Goers - Minneapolis MN, US
Brian A. Shukla - Maplewood MN, US
Michael C. Harper - Hudson WI, US

International Classification:

B24D 3/20
B24D 5/10
B24D 18/00

Abstract:

Methods of making polymer bond abrasive articles and their precursors using powder bed jetting are disclosed. Polymer bond abrasive articles prepared by the method include abrasive articles having arcuate or tortuous cooling channels, unitary structured abrasive discs, abrasive segments, shaped abrasive particles, and abrasive wheels.

US Patent:

20190047214, Feb 14, 2019

Filed:

Mar 30, 2017

Appl. No.:

16/076742

Inventors:

- St. Paul MN, US
Maiken Givot - St. Paul MN, US
Malte Korten - Moorenweis, DE
Robert L.W. Smithson - Mahtomedi MN, US
Brian D. Goers - Minneapolis MN, US
Negus B. Adefris - St. Paul MN, US
Thomas J. Anderson - Cottage Grove MN, US
Brian A. Shukla - Woodbury MN, US
Michael C. Harper - Hudson WI, US
Elizaveta Y. Plotnikov - St. Paul MN, US

International Classification:

B29C 64/153
B29C 64/393
B22F 3/105
B24D 18/00
B24D 3/06
B24D 3/14
B24D 5/10

Abstract:

The present disclosure provides methods of making a vitreous bond abrasive article and a metal bond abrasive article. An abrasive article preform is produced by an additive manufacturing sub-process comprising the deposition of a layer of loose powder particles in a confined region and selective heating via conduction or irradiation to heat treat an area of the layer of loose powder particles. The loose powder particles include abrasive particles and organic compound particles, as well as vitreous bond precursor particles or metal particles. The abrasive article preform produced by additive manufacturing is subsequently heated to provide the vitreous bond abrasive article comprising the abrasive particles retained in a vitreous bond material, or to provide the metal bond abrasive article. Also, the methods include receiving, by an additive manufacturing device having a processor, a digital object specifying data for an abrasive article, and generating the abrasive article with the manufacturing device.

US Patent:

20190022826, Jan 24, 2019

Filed:

Jan 18, 2017

Appl. No.:

16/070316

Inventors:

- St. Paul MN, US
Maiken Givot - St. Paul MN, US
Malte Korten - Moorenweis, DE
Robert L.W. Smithson - Mahtomedi MN, US
Brian D. Goers - Minneapolis MN, US
Negus B. Adefris - St. Paul MN, US
Thomas J. Anderson - Cottage Grove MN, US
Brian A. Shukla - Woodbury MN, US
Michael C. Harper - Hudson WI, US
Elizaveta Y. Plotnikov - St. Paul MN, US

International Classification:

B24D 3/06
B24D 3/14
B24D 5/10
B24D 7/10
B24D 18/00
B29C 64/153
B22F 3/00
B22F 3/105

Abstract:

The present disclosure provides methods of making a vitreous bond abrasive article and a metal bond abrasive article. The methods include sequential steps. Step a) includes a subprocess including sequentially: i) depositing a layer of loose powder particles in a confined region; and ii) selectively applying heat via conduction or irradiation, to heat treat an area of the layer of loose powder particles. The loose powder particles include abrasive particles and organic compound particles, as well as vitreous bond precursor particles or metal particles. The layer of loose powder particles has substantially uniform thickness. Step b) includes independently carrying out step a) a number of times to generate an abrasive article preform comprising the bonded powder particles and remaining loose powder particles. Step c) includes separating remaining loose powder particles from the abrasive article preform. Step d) includes heating the abrasive article preform to provide the vitreous bond abrasive article comprising the abrasive particles retained in a vitreous bond material, or to provide the metal bond abrasive article. A method of making a metal bond abrasive optionally includes infusing an abrasive article preform with a molten lower melting metal and solidifying the molten lower melting metal to provide the metal bond abrasive article. The present disclosure further provides a vitreous bond abrasive article precursor and a metal bond abrasive article precursor.