Randolph Roger Chan

US Patent:

48453439, Jul 4, 1989

Filed:

Nov 28, 1988

Appl. No.:

7/277521

Inventors:

Ted M. Aune - Fremont CA
Paul B. Germeraad - Menlo Park CA
Randolph W. Chan - Palo Alto CA

Assignee:

Raychem Corporation - Menlo Park CA

International Classification:

H05B 334

US Classification:

219545

Abstract:

An electrical heater which includes a fabric prepared from electrodes and an elongate resistive heating element which is composed of a conductive polymer, preferably a PTC conductive polymer, to render the heater self-regulating. The fabric is laminated to, and preferably embedded in, a sheet of an insulating polymer, particularly a non-tracking insulating polymer.

US Patent:

47000546, Oct 13, 1987

Filed:

May 17, 1985

Appl. No.:

6/735428

Inventors:

James T. Triplett - Livermore CA
Paul B. Germeraad - Menlo Park CA
Randolph W. Chan - Sunnyvale CA
Michael L. Jensen - Mountain View CA

Assignee:

Raychem Corporation - Menlo Park CA

International Classification:

H05B 334
H05B 354

US Classification:

219545

Abstract:

An electrical heater which comprises a fabric prepared from at least one of the electrodes and another elongate element of substantially higher resistance. The heater preferably comprises a PTC element, e. g. of a conductive polymer, to render the heater self-regulating. The PTC element may be in the form of a fiber forming part of the fabric, or a layer surrounding one of the electrodes, or a laminar element in which the fabric is embedded. The fabric can if desired be laminated to a sheet of a polymer, e. g. an insulating polymer or a ZTC conductive polymer. A shrinkable fabric heater can be made by incorporating a heat-shrinkable non-conductive filament into the fabric, perpendicular to both electrodes, and is useful for example for enclosing splices in telephone cables.

US Patent:

47433213, May 10, 1988

Filed:

Oct 4, 1985

Appl. No.:

6/784288

Inventors:

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

Assignee:

Raychem Corporation - Menlo Park CA

International Classification:

B32B 3126

US Classification:

156 85

Abstract:

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.

US Patent:

49694022, Nov 13, 1990

Filed:

Jan 31, 1989

Appl. No.:

7/304541

Inventors:

Randolph W. Chan - Palo Alto CA
Lawrence D. Schwartz - Menlo Park CA
Richard E. Rodkey - Pleasanton CA

Assignee:

Raychem Corporation - Menlo Park CA

International Classification:

B41L 3514
B32B 300

US Classification:

101488

Abstract:

Permanent white indicia are applied to a polymeric surface, preferably of a black, heat-recoverable marker sleeve for wire or cable, using an ink composition comprising a pigment that is thermally stable at a temperature of at least about 350. degree. C. , preferably titanium dioxide and a binder, such as nitrocellulose, and then heating the surface to permatize the mark. The marked article passes MIL-STD-202 in mark permanence.

US Patent:

49008773, Feb 13, 1990

Filed:

Jul 12, 1988

Appl. No.:

7/218417

Inventors:

Robert S. Dubrow - Redwood City CA
Christine J. Holland - San Mateo CA
Randolph W. Chan - Palo Alto CA
Albert R. Martin - Oakland CA
Dennis C. Siden - Portola Valley CA
Paul B. Germeraad - Menlo Park CA

Assignee:

Raychem Corporation - Menlo Park CA

International Classification:

H05K 900

US Classification:

174 35GC

Abstract:

This invention provides E. M. I. gaskets for electrically shielding and environmentally sealing the space between two surfaces which comprises a metallic electrically conductive deformable structure adapted for forming electrical contact with said surfaces and/or providing electrical shielding in the space between said surfaces; and a gel material for sealing the space between said surfaces having a cone penetration value of about 100 to about 350 (10. sup. -1 mm) and an ultimate elongation of at least 200% and being present in sufficient amount and positioned to provide environmental seal between said surfaces and to provide environmental protection for said metallic structure. The gel may encapsulate the entire metallic structure so that portions of the metallic structure pierces through the gel when the gasket is installed to make electrical contact. Alternatively portions of the metallic structure may extend beyond the surface of the gel and the gel deforms to cover exposed portions of the metallic structure when the gasket is installed. The gasket of this invention provides moisture seal and is resistant to corrosion.