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:
Sep. 05, 1989
Filed:
Oct. 24, 1988
Applicant:
Inventor:
William C Black, Mound, MN (US);
Assignee:
Northern Microdesign Inc., Minneapolis, MN (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04M / ;
U.S. Cl.
CPC ...
3403 / ; 3403 / ; 340501 ; 34087002 ; 34082555 ; 236 / ;
Abstract
An information transmission system using a pair of transmission interconnections to supply power from a collection station to an operating station, and to transmit information back based on the collection station providing a changing voltage on the two interconnections and the operating station modulating the amount of current drawn about a reference current to represent information.