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:
Feb. 22, 2011
Filed:
Mar. 13, 2009
Applicants:
Roy L. Yarbrough, Hiram, ME (US);
Julie Stultz, Scarborough, ME (US);
Steven M. Macaluso, Scarborough, ME (US);
Inventors:
Roy L. Yarbrough, Hiram, ME (US);
Julie Stultz, Scarborough, ME (US);
Steven M. Macaluso, Scarborough, ME (US);
Assignee:
Fairchild Semiconductor Corporation, South Portland, ME (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02J 1/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A circuit that automatically, seamlessly connects the higher (or the lower) of two power supplies to an output is described. The circuit does not incur a one diode drop when the two power supplies are at about the same voltage levels, and the unused power supply draws no stand-by current. Cross coupled transistor and cross coupled inverters are employed.