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. 03, 1981
Filed:
Aug. 29, 1979
Applicant:
Inventors:
Akitaka Yasujima, Yokohama, JP;
Shingo Ishikawa, Kawasaki, JP;
Assignee:
Asahi-Dow Limited, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
G01J / ;
U.S. Cl.
CPC ...
250339 ; 250341 ; 356357 ;
Abstract
An infrared light is applied to a polymer film having a thickness of less than 30.mu., and the infrared light is spectroscopically separated before or after being applied to the polymer film to obtain an infrared interference fringe spectrum based on the polymer film, and then the extreme points of the infrared interference fringe spectrum are detected by processing, whereby to measure the thickness of the polymer film.