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:
Sep. 20, 1983
Filed:
Jul. 28, 1980
Applicant:
Inventors:
Bruno P Morane, Neuilly, FR;
Gilbert L Legras, Chatillon, FR;
Assignee:
L'Oreal, Paris, FR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01D / ; G04F / ;
U.S. Cl.
CPC ...
116206 ; 116308 ; 194D / ; 368 93 ; 368327 ; 422 88 ;
Abstract
An ageing indicator compares a closed sachet of one or more closed tubes of a material which is slightly permeable to a fluid contained in the sachet or tube. The rate of permeation of the fluid through the sachet-like assembly tube wall depends upon temperature and time of exposure to that temperature so the quantity of fluid loss is indicative of temperature and time; the ageing capable of then being detected either by measuring a column of the liquid in a tube or by observing the appearance or disappearance of printed indicia in the sachet.