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:
Jan. 14, 1992
Filed:
Apr. 25, 1988
Applicant:
Inventors:
Clive Trundle, Silverstone, GB;
Martin J Goodwin, Northants, GB;
Robert Baker-Glenn, Kingsthorpe, GB;
Jack Brettle, Greens Norton, GB;
Neil Carr, New Duston, GB;
Assignee:
Plessey Overseas Limited, Essex, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B05D / ;
U.S. Cl.
CPC ...
427164 ; 427240 ; 427282 ; 427336 ; 427340 ; 4273935 ; 4274121 ;
Abstract
A method of forming optical waveguides is described in which a film of a novolac resin is deposited on a transparent substrate and a dopant material is incorporated into the film during or after the coating step. Additional quantities of the same or different dopant may be incoporated into the dried film by solvent assisted indiffusion.