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:
Jun. 07, 1977
Filed:
Sep. 05, 1975
Rolf H Ochsner, Trumbull, CT (US);
Robertshaw Controls Company, Richmond, VA (US);
Abstract
A method of making a plurality of substantially identical flexible diaphragms for control devices comprising the steps of providing a plurality of sheets of polyester film each being approximately 0.0005 to 0.0010 of an inch thick and each being a circular disc approximately 41/2 inches in diameter and forming the diaphragms from the sheets so that each diaphragm has an annular corrugation formed therein concentric with the center thereof and inboard of the outer periphery thereof, the step of forming the diaphragms comprising the steps of disposing the sheets in stacked aligned relation in a mold and compressing and heating the sheets in the mold in the stacked aligned relation thereof to substantially simultaneously heat form the corrugations in the sheets to thereby make the diaphragms substantially identical to each other.