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:
Nov. 06, 1990
Filed:
Jul. 24, 1989
Applicant:
Inventors:
Albert D Ehrenfried, Maynard, MA (US);
John A Gunnarson, Concord, MA (US);
William E Pierce, Winchendon, MA (US);
Thomas C Thorstensen, Westford, MA (US);
Assignee:
Metritape, Inc., Littleton, MA (US);
Primary Examiner:
Int. Cl.
CPC ...
G01F / ; H01C / ;
U.S. Cl.
CPC ...
73301 ; 338256 ;
Abstract
Sheathing for a resistance-tape level sensor which provides a multiplicity of enclosing envelopes for guarding the critical inner electrical sensing element, and multiple venting paths for respiration and pressure-equalization of chambers formed by the separate envelopes.