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. 14, 2023
Filed:
Aug. 30, 2022
Applicant:
John Crane Inc., Chicago, IL (US);
Inventors:
Prashanthi Tirunagari, Deerfield, IL (US);
James R. Wasser, Lake Forest, IL (US);
Assignee:
JOHN CRANE INC., Morton Grove, IL (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16J 15/36 (2006.01); F16J 15/34 (2006.01); F16J 15/00 (2006.01);
U.S. Cl.
CPC ...
F16J 15/36 (2013.01); F16J 15/004 (2013.01); F16J 15/348 (2013.01); F16J 15/3452 (2013.01);
Abstract
A mechanical seal assembly adapted for arrangement around a rotating shaft of a pump has first and second seals. Both include primary and mating rings, biasing mechanisms and annular flexible sealing membranes. The two seals can have different seal balances or different biasing forces (or both) to allow the second seal to run dry for extended periods.