The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 19, 1993
Filed:
Dec. 11, 1991
Applicant:
Inventors:
Jeff Shafe, Redwood City, CA (US);
O James Straley, Redwood City, CA (US);
Gordon McCarty, San Jose, CA (US);
Ravinder K Oswal, Union City, CA (US);
Amitkumar N Dharia, Newark, CA (US);
Assignee:
Raychem Corporation, Menlo Park, CA (US);
Primary Examiner:
Int. Cl.
CPC ...
H01C / ; H01C / ;
U.S. Cl.
CPC ...
338 / ; 338 / ; 427 58 ; 427256 ; 427287 ;
Abstract
A polymer thick film ink which exhibits PTC behavior comprising an organic polymer which is crystalline, an active solvent suitable for dissolving the polymer, and carbon black which has a pH of less than 4.0. The ink is particularly useful in producing electrical devices such as heaters and circuit protection devices.