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:
Jan. 24, 1989
Filed:
Jan. 28, 1988
Applicant:
Inventor:
William C Swanson, Clarendon Hills, IL (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B66F / ;
U.S. Cl.
CPC ...
414700 ; 91520 ; 91532 ; 91535 ;
Abstract
Level lifting and lowering of a working implement in combination with a hydraulic boom is provided through a hydraulic circuit and valve including a shuttle check valve, a rotary flow divider and a counterbalance valve. Selective operation results in the working implement being raised or lowered in a level displacement relative to the ground.