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:
Aug. 28, 1990
Filed:
Feb. 27, 1989
Applicant:
Inventors:
Ralph E Frazee, Jr, Bricktown, NJ (US);
David H Smithgall, Sr, East Windsor, NJ (US);
Assignee:
American Telephone and Telegraph Company, New York, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C03B / ;
U.S. Cl.
CPC ...
65-312 ; 356 731 ; 356381 ;
Abstract
A laser (20) directs a laser beam at an optical fiber (12) and the resulting forward-scattered light is detected by a detector (21). The energy of the foward-scattered laser light is monotonically inversely proportional to the thickness of a carbon coating on the optical fiber. A computer (22) generates an electrical signal for controlling carbon coating thickness by driving a valve (24) to control the flow of acetylene from a source (14) used to coat the optical fiber in a coating chamber (13).