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. 15, 1977
Filed:
Mar. 12, 1976
Applicant:
Inventors:
Robert J Whelchel, Dunwoody, GA (US);
William A Lawrence, Simi Valley, CA (US);
Assignee:
Elevator Equipment Co., Los Angeles, CA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F15B / ;
U.S. Cl.
CPC ...
1376121 ; 91400 ; 91452 ; 13759613 ; 13759616 ;
Abstract
A hydraulic valve assembly for operating a hydraulic elevator is simplified in its construction by positioning the check valve for the up level control in axial alignment with the bypass valve in the same valve housing mutually guided on a central valve stem. Pressure for actuating the bypass valve is controlled by a direct acting valve element structurally mounted on the valve element of the up leveling check valve.
Whelchel, Robert. (1977). Unitary elevator up level control valve (U.S. Patent No. 4011888). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4011888
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile