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. 09, 1990
Filed:
Nov. 06, 1987
Applicant:
Inventors:
Erik Janzen, Vaster.ang.s, SE;
Rune Tenghamn, Vaster.ang.s, SE;
Assignee:
AB ASEA-Atom, , SE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04B / ;
U.S. Cl.
CPC ...
455612 ; 250256 ; 340854 ; 455600 ; 455617 ;
Abstract
Data logging at temperatures up to 200.degree. C. by optical signals sent via a 'wet' optical fiber is achieved by using as a light source device an LED having a peak amplitude wavelength at ambient temperature which is sufficiently removed from 1390 .ANG. so that acceptable transmission levels can pass through the fiber when the wavelength/temperature shift of the LED is allowed for.