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. 07, 1978
Filed:
Jan. 19, 1977
Applicant:
Inventors:
Trueman W Hiller, Bettendorf, IA (US);
David C Hamstra, Clinton, IA (US);
Assignee:
Wylain, Inc., Dallas, TX (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G08B / ;
U.S. Cl.
CPC ...
340243 ; 141-7 ; 141 59 ; 141 95 ; 141290 ; 364510 ;
Abstract
A method and apparatus for detecting blockages in one or more vapor flow lines such as vapor recovery lines used in liquid gasoline dispensing systems. The method and apparatus operate by sensing pressure in vapor flow lines and determining whether the frequency of the variations in the filtered rate of change with time of the pressure signal exceeds a preset limit indicating vapor bubbling through a liquid blockage. The method and apparatus also operate to determine whether the pressure signal exceeds a preset limit indicating a blockage condition.