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:
Apr. 13, 1982
Filed:
Dec. 31, 1979
Arthur A Parmet, Burlington, MA (US);
Charles W Dawson, East Bridgewater, MA (US);
Honeywell Information Systems Inc., Waltham, MA (US);
Abstract
Information from a document is read by a reader sorter; the information is organized in fields including a transit field which is made up of 8 decimal digits and a check digit. The 8 decimal digits are each multiplied by a predetermined number which depends on the position of the decimal digit in the transit field as indicated by a position counter. Signals indicative of the decimal digit and the position in the transit field are applied to the address terminals of a Programmable Read Only Memory (PROM). Each address location stores the units position of the product of the multiplication of the decimal digit times the predetermined value. A firmware routine stored in a control memory performs the check digit calculation 'on the fly' using the units position of the product from the PROM and certain status bits stored in a scratchpad memory.