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:
Jun. 08, 1976
Filed:
Jan. 03, 1975
Applicant:
Inventors:
Benedict J Drda, Medina, OH (US);
Maxwell Meredith, Chelmsford, MA (US);
Assignee:
LFE Corporation, Waltham, MA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H05B / ;
U.S. Cl.
CPC ...
219210 ; 219501 ; 219505 ; 307310 ;
Abstract
A transistor with its base-emitter bias controlled by a positive temperature coefficient thermistor provides a controlled heat source for maintaining precise temperature within a small oven which is used to contain and provide a stable temperature for temperature sensitive elements of external circuits.