Patents by Inventor Prashanthi Tirunagari

Prashanthi Tirunagari has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Non-pusher dry gas seal with sealing elastomer and systems utilizing same
    Patent number: 11821523
    Abstract: A seal that can be used alone or as a containment seal for another seal includes a primary ring (36) and a mating ring (30), the primary ring being axially shiftable relative to a rotating shaft (12) and the mating ring being axially fixable relative to the rotating shaft, a biasing mechanism (500) that urges the primary ring toward the mating ring, and an annular flexible sealing membrane (100). The membrane includes a flange portion (102) disposed at least partially between the biasing mechanism and the primary ring, a coaxial portion (104) that is axially fixable relative to the shaft, and a flexible connection portion (106) positioned within a radially inward extent of the flange portion and connecting the flange portion to the coaxial portion.
    Type: Grant
    Filed: September 4, 2020
    Date of Patent: November 21, 2023
    Assignee: JOHN CRANE INC.
    Inventors: James R. Wasser, Prashanthi Tirunagari
  • Non-pusher dry running seal with sealing elastomer as a backup in sliding seal system
    Patent number: 11815185
    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.
    Type: Grant
    Filed: August 30, 2022
    Date of Patent: November 14, 2023
    Assignee: JOHN CRANE INC.
    Inventors: Prashanthi Tirunagari, James R. Wasser
  • NON-PUSHER DRY RUNNING SEAL WITH SEALING ELASTOMER AS A BACKUP IN SLIDING SEAL SYSTEM
    Publication number: 20230074820
    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.
    Type: Application
    Filed: August 30, 2022
    Publication date: March 9, 2023
    Inventors: Prashanthi Tirunagari, James R. Wasser
  • NON-PUSHER DRY GAS SEAL WITH SEALING ELASTOMER AND SYSTEMS UTILIZING SAME
    Publication number: 20220205540
    Abstract: A seal that can be used alone or as a containment seal for another seal includes a primary ring (36) and a mating ring (30), the primary ring being axially shiftable relative to a rotating shaft (12) and the mating ring being axially fixable relative to the rotating shaft, a biasing mechanism (500) that urges the primary ring toward the mating ring, and an annular flexible sealing membrane (100). The membrane includes a flange portion (102) disposed at least partially between the biasing mechanism and the primary ring, a coaxial portion (104) that is axially fixable relative to the shaft, and a flexible connection portion (106) positioned within a radially inward extent of the flange portion and connecting the flange portion to the coaxial portion.
    Type: Application
    Filed: September 4, 2020
    Publication date: June 30, 2022
    Inventors: James R. WASSER, Prashanthi Tirunagari