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:
Mar. 01, 1977
Filed:
Dec. 11, 1975
Gerald Weber, Braunschweig, DT;
Jurgen Sorgenfrei, Braunschweig-Volkmarode, DT;
Olympia Werke AG, Wilhelmshaven, DT;
Abstract
A circuit arrangement for selectively adding or subtracting two binary coded decimal numbers exclusively by means of addition operations, in which addition involves adding a binary coded decimal value corresponding to the decimal value '6' to each digit of one of the numbers to be added and adding a binary coded decimal value corresponding to the decimal value '10' when the addition of corresponding digits of the two numbers and the value '6' does not produce a carry, and in which subtraction involves forming the unit complement to each digit of the subtrahend, adding together the unit complement of each digit, to the corresponding digit of the minuend, and a value of '1', and then adding the binary coded decimal value corresponding to the decimal value '10' when the previous addition does not produce a carry.