Joseph William Rich

US Patent:

42152496, Jul 29, 1980

Filed:

Apr 25, 1978

Appl. No.:

5/900016

Inventors:

John M. Reynard - Framingham MA
Thomas N. Carignan - Danvers MA
Richard Paglia - Carlisle MA
Joseph F. Rich - Danvers MA

Assignee:

Polaroid Corporation - Cambridge MA

International Classification:

H04R 714
H04R 1900

US Classification:

179111R

Abstract:

A method and device for significantly improving the efficiency and sensitivity of an electroacoustical transducer. A relatively inelastic vibratile diaphragm is preformed to the shape of a mating backplate prior to the time it is actually mated to said backplate. By such preforming, the efficiency and sensitivity reducing effects from a wrinkled transducer diaphragm are minimized in that said wrinkles move to a diaphragm region where they have no effect on transducer sensitivity when the backplate is subsequently mated to said diaphragm.

US Patent:

44018584, Aug 30, 1983

Filed:

Mar 24, 1981

Appl. No.:

6/247124

Inventors:

John M. Reynard - Framingham MA
Thomas N. Carignan - Danvers MA
Richard Paglia - Carlisle MA
Joseph R. Rich - Danvers MA

Assignee:

Polaroid Corporation - Cambridge MA

International Classification:

H04R 1900

US Classification:

179111R

Abstract:

A method and device for significantly improving the efficiency and sensitivity of an electroacoustical transducer. A relatively inelastic vibratile diaphragm is preformed to the shape of a mating backplate prior to the time it is actually mated to said backplate. By such preforming, the efficiency and sensitivity reducing effects from a wrinkled transducer diaphragm are minimized in that said wrinkles move to a diaphragm region where they have no effect on transducer sensitivity when the backplate is subsequently mated to said diaphragm.

US Patent:

20230065541, Mar 2, 2023

Filed:

Aug 25, 2022

Appl. No.:

17/822244

Inventors:

- Worcester MA, US
- Conflans-Sainte-Honorine, FR
Srikanth Rapaka - Natick MA, US
Joseph R. Rich - Clinton MA, US
Katherine M. Sahlin - Old Orchard Beach ME, US
Nilanjan Sarangi - Shrewsbury MA, US
Andrew B. Schoch - Westborough MA, US

International Classification:

C09K 3/14
B24D 5/02
B24D 5/12
B24D 7/02
B24D 18/00

Abstract:

A fixed abrasive article having a body including abrasive particles contained within a bond material, the abrasive particles including shaped abrasive particles or elongated abrasive particles having an aspect ratio of length:width of at least 1.1:1, each of the shaped abrasive particles or elongated abrasive particles having a predetermined position or a predetermined three-axis orientation.