Fred J Roska

US Patent:

6965474, Nov 15, 2005

Filed:

Feb 12, 2003

Appl. No.:

10/365250

Inventors:

Matthew B. Johnson - St. Paul MN, US
Richard C. Allen - Lilydale MN, US
Fred J. Roska - Woodbury MN, US
Steven J. Rhyner - St. Paul MN, US
William W. Merrill - White Bear Lake MN, US
Joan M. Strobel - Maplewood MN, US
Kevin M. Hamer - St. Paul MN, US

Assignee:

3M Innovative Properties Company - Saint Paul MN

International Classification:

G02B027/28
G02B005/30

US Classification:

359500, 359494, 349 96, 349117

Abstract:

An optical film includes a layer of simultaneous biaxially stretched polyolefin film that is substantially non-absorbing and non-scattering for at least one polarization state of visible light. The layer has x, y, and z orthogonal indices of refraction where at least two of the orthogonal indices of refraction are not equal. The layer has an in-plane retardance of 100 nm or less and an out-of-plane retardance of 50 nm or greater.

US Patent:

7099083, Aug 29, 2006

Filed:

Jan 29, 2004

Appl. No.:

10/770604

Inventors:

Matthew B. Johnson - St. Paul MN, US
Richard C. Allen - Lilydale MN, US
Fred J. Roska - Woodbury MN, US
Steven J. Rhyner - St. Paul MN, US
William W. Merrill - White Bear Lake MN, US
Joan M. Strobel - Maplewood MN, US
Kevin M. Hamer - St. Paul MN, US

Assignee:

3M Innovative Properties Company - St. Paul MN

International Classification:

G02B 27/28
G02B 5/30

US Classification:

359500, 359494

Abstract:

An optical film includes a layer of simultaneous biaxially stretched polyolefin film that is substantially non-absorbing and non-scattering for at least one polarization state of visible light. The layer has x, y, and z orthogonal indices of refraction where at least two of the orthogonal indices of refraction are not equal. The layer has an in-plane retardance of 100 nm or less and an absolute value of an out-of-plane retardance being 55 nm or greater.

US Patent:

7110072, Sep 19, 2006

Filed:

Jan 29, 2004

Appl. No.:

10/767708

Inventors:

Fred J. Roska - Woodbury MN, US
Richard C. Allen - Lilydale MN, US
Matthew B. Johnson - St. Paul MN, US
Steven J. Rhyner - St. Paul MN, US
William W. Merrill - White Bear Lake MN, US
Joan M. Strobel - Maplewood MN, US
Kevin M. Hamer - St. Paul MN, US
Gregory E. Gilligan - Hastings MN, US

Assignee:

3M Innovative Properties Company - St. Paul MN

International Classification:

G02F 1/1335

US Classification:

349118, 349 74

Abstract:

An optical stack includes a first liquid crystal layer and a j-retarder disposed on the liquid crystal layer. The j-retarder includes a simultaneous biaxially stretched polymeric film being substantially non-absorbing and non-scattering for at least one polarization state of visible light. The j-retarder has x, y, and z orthogonal indices of refraction where at least two of the orthogonal indices of refraction are not equal, an in-plane retardance being 100 nm or less and an absolute value for an out-of-plane retardance being 55 nm or greater.

US Patent:

7132065, Nov 7, 2006

Filed:

Feb 12, 2003

Appl. No.:

10/364940

Inventors:

Richard C. Allen - Lilydale MN, US
Matthew B. Johnson - St. Paul MN, US
Fred J. Roska - Woodbury MN, US
Steven J. Rhyner - St. Paul MN, US
William W. Merrill - White Bear Lake MN, US
Joan M. Strobel - Maplewood MN, US
Kevin M. Hamer - St. Paul MN, US
John M. Klaeser - Greenville SC, US
Sebastian F. Zehentmaier - Greenville SC, US

Assignee:

3M Innovative Properties Company - St. Paul MN

International Classification:

B29C 55/14

US Classification:

264 27, 2642902, 264348

Abstract:

A process for making an optical film includes stretching a polyolefin film in a first direction and stretching the polyolefin film in a second direction different than the first direction forming a biaxially stretched polyolefin film. At least a portion of the stretching of the polyolefin film in the second direction occurs simultaneous with the stretching of the polyolefin film in the first direction. The biaxially stretched polyolefin film has a length and a width and substantially non-absorbing and non-scattering for at least one polarization state of visible light. The biaxially stretched polyolefin film has x, y, and z orthogonal indices of refraction where at least two of the orthogonal indices of refraction are not equal, an in-plane retardance being 100 nm or less and an out-of-plane retardance being 50 nm or greater.

US Patent:

7405784, Jul 29, 2008

Filed:

Feb 12, 2003

Appl. No.:

10/365332

Inventors:

Fred J. Roska - Woodbury MN, US
Richard C. Allen - Lilydale MN, US
Matthew B. Johnson - St. Paul MN, US
Steven J. Rhyner - St. Paul MN, US
William W. Merrill - White Bear Lake MN, US
Joan M. Strobel - Maplewood MN, US
Kevin M. Hamer - St. Paul MN, US
Gregory E. Gilligan - Hastings MN, US

Assignee:

3M Innovative Properties Company - St. Paul MN

International Classification:

G02F 1/1335

US Classification:

349114

Abstract:

An optical stack includes a first liquid crystal layer and a j-retarder disposed on the liquid crystal layer. The j-retarder includes a simultaneous biaxally stretched polymeric film being substantially non-absorbing and non-scattering for at least one polarization state of visible light. The j-retarder has x, y, and z orthogonal indices of refraction where at least two of the orthogonal indices of refraction are not equal, an in-plane retardance being 100 nm or less and an out-of-plane retardance being 50 nm or greater.

US Patent:

20040265575, Dec 30, 2004

Filed:

Jul 26, 2004

Appl. No.:

10/899568

Inventors:

Chiu Wong - Vadnais Heights MN, US
Thomas Hanschen - St. Paul MN, US
Anthony Ferguson - Lake Elmo MN, US
William Merrill - White Bear Lake MN, US
Fred Roska - Woodbury MN, US
Jeffery Jackson - Woodbury MN, US

Assignee:

3M Innovative Properties Company

International Classification:

B32B007/12
D02J001/22
B32B015/04
B29C055/00

US Classification:

428/343000, 428/352000, 428/354000

Abstract:

A simultaneously biaxially stretched polypropylene film having unique properties is disclosed. The properties result from the unique method of making the film and include: a tensile elongation to break in the first stretch direction of at least 110%; a tensile volumetric energy to break in the first stretch direction of at least 18,000 in-lb/in; and, a variability in film thickness along the first stretch direction, as measured by the standard deviation relative to the average, of less than 10%.

US Patent:

20060012879, Jan 19, 2006

Filed:

Sep 6, 2005

Appl. No.:

11/220157

Inventors:

Matthew Johnson - St. Paul MN, US
Richard Allen - Lilydale MN, US
Fred Roska - Woodbury MN, US
Steven Rhyner - St. Paul MN, US
William Merrill - White Bear Lake MN, US
Joan Strobel - Maplewood MN, US
Kevin Hamer - St. Paul MN, US

International Classification:

G02B 5/30
G02B 27/28

US Classification:

359500000

Abstract:

An optical film includes a layer of simultaneously biaxially stretched polyolefin film that is substantially non-absorbing and non-scattering for at least one polarization state of visible light. The layer has x, y, and z orthogonal indices of refraction where at least two of the orthogonal indices of refraction are not equal. The layer has an in-plane retardance of 100 nm or less and an out-of-plane retardance of 50 nm or greater.

US Patent:

20060238682, Oct 26, 2006

Filed:

Jun 29, 2006

Appl. No.:

11/427413

Inventors:

Fred Roska - Woodbury MN, US
Richard Allen - Lilydale MN, US
Matthew Johnson - St. Paul MN, US
Steven Rhyner - St. Paul MN, US
William Merrill - White Bear Lake MN, US
Joan Strobel - Maplewood MN, US
Kevin Hamer - St. Paul MN, US
Gregory Gilligan - Hastings MN, US

International Classification:

G02F 1/1335

US Classification:

349117000

Abstract:

An optical stack includes a first liquid crystal layer and a j-retarder disposed on the liquid crystal layer. The j-retarder includes a simultaneous biaxially stretched polymeric film being substantially non-absorbing and non-scattering for at least one polarization state of visible light. The j-retarder has x, y, and z orthogonal indices of refraction where at least two of the orthogonal indices of refraction are not equal, an in-plane retardance being 100 nm or less and an absolute value for an out-of-plane retardance being 55 nm or greater.