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:
Jul. 20, 1976
Filed:
Dec. 26, 1974
Applicant:
Inventor:
Philip A Hoffman, Towson, MD (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02J / ;
U.S. Cl.
CPC ...
320-2 ; 310 50 ; 320 39 ; 320D / ; 323 / ;
Abstract
Disclosed is a battery operated hand tool which has incorporated directly into its housing a novel battery charging circuit. The charger normally operates off a conventional household power outlet and comprises a solid state switching circuit for recharging the battery with a series of electrical impulses. In some special cases, it can be operated in a non-switching state. External inductance is eliminated by charging the battery through the hand tool motor.