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:
Nov. 05, 1991
Filed:
Oct. 20, 1989
Applicant:
Inventors:
Luther W Martin, Champaign, IL (US);
Richard L Smith, Edwardsville, IL (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16L / ;
U.S. Cl.
CPC ...
2989014 ; 2940203 ; 138 97 ;
Abstract
A method for inserting a smaller cross sectional area, higher pressure fluid conduit or 'main' into a larger cross sectional area, lower pressure fluid main, includes inserting a length of smaller diameter gas main into a length of larger diameter gas main while the larger diameter gas main remains pressurized with the gas. The method includes providing a parallel gas pathway from a section of larger diameter main upstream toward the gas supply from the length of larger diameter main into which the smaller diameter main is to be inserted.