DR. PETER JOHANNES VAN ROESSEL, MD PHD
Psychiatric at Pasteur Dr, Palo Alto, CA

5285299, Feb 8, 1994

Sep 26, 1991

7/766419

Paul S. Drzaic - Palo Alto CA
Peter H. van Konynenburg - Palo Alto CA

Raychem Corporation - Menlo Park CA

G02F 113

359 52

A liquid crystal apparatus including a low birefringence encapsulated liquid crystal material in a containment medium. The liquid crystal material contains a dye that conforms to the structure of the liquid crystal material. The difference between the ordinary index of refraction and extraordinary index of refraction of the liquid crystal material is between about 0. 050 and 0. 115. The index of refraction of the containment is greater than the ordinary index of refraction of the liquid crystal material. The liquid crystal apparatus provides low haze at off-axis viewing angles, permits efficient sine-wave power operation, and provides energy control.

4743321, May 10, 1988

Oct 4, 1985

6/784288

Pravin L. Soni - Union City CA
Peter H. Van Konynenburg - Palo Alto CA
Mark Wartenberg - San Jose CA
Randolph W. Chan - Sunnyvale CA
Stephen M. Jacobs - Cupertino CA

Raychem Corporation - Menlo Park CA

B32B 3126

156 85

The resistivity/temperature characteristics of PTC conductive polymers which have little or no cross-linking can be modified by stretching. The rate at which resistivity rises with temperature is increased, and the peak resistivity is decreased; however, the decrease in peak resistivity is substantially smaller than that observed with PTC conductive polymers having a high degree of cross-linking. Therefore, heat-recoverable electrical devices, particularly for covering telephone and other cable splices, comprise (a) a layer of a PTC conductive polymer which has little or no cross-linking, (2) an adjacent heat-recoverable layer of a PTC or ZTC conductive polymer which has a relatively high level of cross-linking, and (3) electrodes which can be connected to a power supply so that current passes through the layers and causes recovery of the device; preferably an uncrosslinked PTC layer is sandwiched between two cross-linked ZTC layers. Non-recoverable devices, e. g. heaters, can have valuable characteristics when they comprise PTC conductive polymer elements which have been given a relatively low degree of orientation by stretching.

6221282, Apr 24, 2001

Jul 13, 1981

6/282547

Peter H. van Konynenburg - Palo Alto CA

H01B 124, C08K 304

252511

Electrical devices which comprise a PTC element composed of a PTC conductive polymer composition and a contiguous CW element composed of a conductive polymer composition which comprises an organic thermoplastic polymer and a conductive carbon black having a particle size (D) in millimicrons and surface area (S) in m. sup. 2 /g such that S/D is at least 10. D is preferably less than 27 millimicrons, especially less than 18 millicrons. S/D is preferably at least 12, especially at least 18. Particularly useful devices are in the form of heaters.

5093898, Mar 3, 1992

Feb 14, 1991

7/655876

Peter H. van Konynenburg - Palo Alto CA
Andrew Au - Fremont CA

Raychem Corporation - Menlo Park CA

H01G 904

392451

Conductive polymer compositions based on polyvinylidene fluoride have improved properties when the polyvinylidene fluoride has a very regular structure which can be characterized by a low head-to-head content in the repeating units. The improved properties include electrical stability when contacted by organic fluids and/or when maintained at elevated temperatures in air. Such compositions which exhibit PTC behavior are particularly useful in the form of self-limiting heaters which are immersed in organic fluds, especially flexible strip heaters for heating diesel fuel before it passes through a fuel filter.

5156452, Oct 20, 1992

Jul 20, 1989

7/382862

Paul Drzaic - Palo Alto CA
Peter H. Van Konynenburg - Palo Alto CA

G02F 113

359 51

A liquid crystal apparatus including a low birefringence encapsulated liquid crystal material in a containment medium. The difference between the ordinary index of refraction and extraordinary index of refraction of the liquid crystal material is between about 0. 050 and 0. 115. The index of refraction of the containment is greater than the ordinary index of refraction of the liquid crystal material. The liquid crystal apparatus provides low haze at off-axis viewing angles and permits efficient sine-wave power operation.

5025131, Jun 18, 1991

Jan 5, 1990

7/461199

Peter H. van Konyenburg - Palo Alto CA
Andrew Au - Fremont CA

Raychem Corporation - Menlo Park CA

H01G 904

392451

Conductive polymer compositions based on polyvinylidene fluoride have improved properties when the polyvinylidene fluoride has a very regular structure which can be characterized by a low head-to-head content in the repeating units. The improved properties include electrical stability when contacted by organic fluids and/or when maintained at elevated temperatures in air. Such compositions which exhibit PTC behavior are particularly useful in the form of self-limiting heaters which are immersed in organic fluids, especially flexible strip heaters for heating diesel fuel before it passes through a fuel filter.

4304987, Dec 8, 1981

Sep 14, 1979

6/075413

Peter H. van Konynenburg - Palo Alto CA

Raychem Corporation - Menlo Park CA

H05B 312

219553

Electrical devices which comprise a PTC element composed of a PTC conductive polymer composition and a contiguous CW element composed of a conductive polymer composition which comprises an organic thermoplastic polymer and a conductive carbon black having a particle size (D) in millimicrons and surface area (S) in m. sup. 2 /g such that S/D is at least 10. D is preferably less than 27 millimicrons, especially less than 18 millimicrons. S/D is preferably at least 12, especially at least 18. Particularly useful devices are in the form of heaters.

4935156, Jun 19, 1990

Sep 27, 1982

6/423589

Peter H. van Konynenburg - Palo Alto CA
Andrew Au - Fremont CA

Raychem Corporation - Menlo Park CA

H01B 106

219553

Conductive polymer compositions based on polyvinylidene fluoride have improved properties when the polyvinylidene fluoride has a very regular structure which can be characterized by a low head-to-head content in the repeating units. The improved properties include electrical stability when contacted by organic fluids and/or when maintained at elevated temperatures in air. Such compositions which exhibit PTC behavior are particularly useful in the form of self-limiting heaters which are immersed in organic fluids, especially flexible strip heaters for heating diesel fuel before it passes through a fuel filter.