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. 09, 2004
Filed:
Nov. 16, 2001
Pierre R. Delajoud, Neuilly sur Seine, FR;
CalAmerica Corp., Phoenix, AZ (US);
Abstract
A device for accurately measuring the pressure (Pg) of very highly pressurized gas includes a cylinder ( ) having a cylindrical outer surface ( A) and a bore extending through the cylinder and an elongated piston ( ) rotatable and vertically movable in the bore, and supporting calibration weights by means of the piston. An internal reservoir ( ) is formed by providing a housing ( ) to support the cylinder, the housing including a lower portion engaging a bottom portion of the cylinder and a lower peripheral portion of the cylinder and an upper portion engaging an upper peripheral portion of the cylinder, an inner portion of the housing ( ) and a portion of the outer surface ( A). An interior of the reservoir ( ) is pressurized through a passage ( A) extending from the reservoir to pressurize gas inlet. A passage ( ) conducts pressurized oil from the reservoir into a gap between the piston ( ) and the bore.