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. 14, 1978
Filed:
Sep. 26, 1975
John M Vandling, Pleasantville, NY (US);
Exxon Research & Engineering Co., Linden, NJ (US);
Abstract
A facsimile transmitter comprises a rotatable drum and a detector for detecting dark-light variations in a document mounted on the drum. A frequency modulator is coupled to the detector for generating frequency modulated transmission signals representing dark-light variations in the document. A sync generator, which generates synchronizing pulses coincident with juxtaposition between the detector and the document-holding clamp on the drum, is also coupled to the frequency modulator. The transmission mode, e.g. the choice of utilizing an internal stable frequency or external power line frequency synchronizing signal to synchronize the drive of the drum, is signaled by varying the length of the synchronizing pulse during the sync period preceding transmission of document information.