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:
Oct. 13, 1992
Filed:
Dec. 22, 1989
Applicant:
Inventors:
Gerard Fortunato, Lyons, FR;
Dominique Laurent, Vienne, FR;
Assignee:
Societe Nationale Elf Aquitaine, Courbevoie, FR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01B / ;
U.S. Cl.
CPC ...
356346 ; 356351 ;
Abstract
An interferometric unit consisting of a birefringent plate combined with an isotropic plate. This unit makes it possible to work with materials whose birefringence is slight and/or to reduce the necessary thickness of the birefringent plate. The unit is suited for integration into an interferometric device whose particular application is the detection of gases with quasi-periodic absorption structure absorbing in the infra-red.