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:
Jul. 04, 1978
Filed:
Jan. 27, 1977
George J Gendron, Houston, TX (US);
Henry A Holland, Houston, TX (US);
Raymond International Inc., Houston, TX (US);
Abstract
An underwater hammer, of the gas discharge type, is provided with a circumferential control valve on the hammer ram to allow free flow of water and gas upwardly along the ram in the annular clearance between the ram and a tubular sleeve in which it is guided, but to interrupt the flow of water downwardly along the ram. The control valve allows the region under the ram to be purged of water when the ram is driven upwardly in the sleeve and it prevents water thereafter from flowing back down under the ram where it would otherwise cushion ram impact on an anvil.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile