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. 14, 1980
Filed:
Nov. 30, 1978
Applicant:
Inventors:
William B Hart, Ipswich, GB;
Reginald T Williams, Hadleigh, GB;
Assignee:
Delta Materials Research Limited, Ipswich, GB;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G05D / ;
U.S. Cl.
CPC ...
236 / ; 2361 / ; 251D / ;
Abstract
A valve which opens and closes according to the temperature of the fluid passing through it has a fluid-controlling valve member consisting of a helix of a shape memory effect material having an elastic modulus which varies significantly with temperature in a reversible manner. At relatively low fluid temperature, the turns of the helix are closely compacted and obstruct the flow, while at relatively high fluid temperature, the turns are expanded and allow flow of fluid between them.