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:
May. 04, 1982
Filed:
Oct. 23, 1980
Applicant:
Inventor:
William R Landis, Bloomington, MN (US);
Assignee:
Honeywell Inc., Minneapolis, MN (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01H / ;
U.S. Cl.
CPC ...
361175 ; 340578 ;
Abstract
A flame detection circuit means that is responsive to an ultraviolet responsive tube is provided with a safety circuit. The safety circuit encompasses a pulse responsive circuit that is responsive to the characteristic conduction pattern of an ultraviolet responsive type of tube and will not respond to a shunt resistance. The circuit relies on the normal conductivity of a shorting field effect transistor that must be gated into a nonconductive state for an output means to be activated.
Landis, William. (1982). Selective ultraviolet signal amplifier circuit (U.S. Patent No. 4328527). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4328527
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile