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:
Feb. 08, 1977
Filed:
Jul. 07, 1975
Applicant:
Inventor:
Hans Kristian Holmen, Voyenenga, NO;
Assignee:
Lehmkuhl A/S, Oslo, NO;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01F / ;
U.S. Cl.
CPC ...
73302 ;
Abstract
The invention relates to a method and apparatus for exact measurement of pressures by means of level or pressure measuring equipment of the bubble tube type. The equipment comprises a bubble tube, a source of pressure, a pressure transducer, and valves which are controlled by a sequence switch means. The invention is characterized in that immediately prior to taking a measurement the source of pressure is connected to the bubble tube for expelling possible liquid therein and in that the source of pressure is then disconnected from the bubble tube. The pressure transducer is connected to the bubble tube during a measuring interval of short duration.