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:
Dec. 07, 1999
Filed:
Apr. 28, 1998
Abstract
A hydraulic pump jack drive system for reciprocating an oil well pump rod. The drive system comprises at least one hydraulic well head cylinder, a reversible flow hydraulic pump, and a master cylinder. The master cylinder has a free floating master piston and at least one fixed bulkhead. The master cylinder also has a working fluid chamber hydraulically connected to the hydraulic well head cylinder and at least two master piston drive chambers hydraulically connected to the hydraulic pump. The hydraulic well head cylinder and the working fluid chamber are filled with a working fluid and define a working fluid system while the master piston drive chambers and the hydraulic pump are filled with hydraulic fluid and define a hydraulic drive system. Reversing the flow of the hydraulic pump causes the master piston drive chambers to be pressurized and de-pressurized on an alternating basis to reciprocally move the master piston within the master cylinder. The reciprocating master piston causes an alternating pressuring and de-pressurizing of the working fluid chamber and the well head cylinder thereby causing the pump rod to reciprocate within the oil well.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile