US3381970A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low-friction high-pressure seal assembly
Assignee: Otis Engineering Corp
•
Filing: 1964-10-16
•
Granted: 1968-05-07
•
Expires: 1984-10-16
Abstract
No abstract record available.
Inventors
- 👤 Norman F Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:49
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/166
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
177 words
A PRESSURE SEAL FOR EFFECTING A SEALED RELATIONSHIP BETWEEN AT LEAST TWO SURFACES COMPRISING IN COMBINATION: A SEAL HOUSING A STUFFING BOX FORMED THEREIN; A CYLINDRICAL MEMBER EXTENDING THROUGH SAID STUFFING BOX; AT LEAST ONE OF SAID HOUSING AND SAID CYLINDRICAL MEMBER BEING MOVABLE WITH RESPECT TO THE OTHER; A BACK-UP RING POSITIONED IN SAID STUFFING BOX FOR CONTACTING A FIRST SURFACE IN SAID STUFFING BOX AND AN ADJACENT SURFACE OF SAID CYLINDRICAL MEMBER; A PRIMARY SEAL RING SUPPORTED FOR CONTACT WITH SAID ADJACENT SURFACE INWARDLY OF SAID BACKUP RING TOWARD A SOURCE OF PRESSURE BETWEEN SAID HOUSING AND SAID CYLINDRICAL MEMBER; SECONDARY SEAL RING MEANS SUPPORTED AROUND AND ENGAGEABLE WITH SAID PRIMARY SEAL RING AND A SECOND SURFACE OF SAID STUFFING BOX; MEANS BIASING SAID SECONDARY SEAL RING MEANS FOR MOVEMENT WITH RESPECT TO SAID PRIMARY SEAL RING AND SAID STUFFING BOX AWAY FROM SAID PRESSURE SOURCE; WEDGE MEANS ON SAID PRIMARY SEAL RING AND SAID SECONDARY SEAL RING MEANS ENGAGEABLE UPON SUCH MOVEMENT OF SAID SECONDARY SEAL RING MEANS WITH RESPECT TO SAID PRIMARY SEAL
Claim 2
Dependent Claim
177 words
A PRESSURE SEAL FOR EFFECTING A SEALED RELATIONSHIP BETWEEN AT LEAST TWO SURFACES COMPRISING IN COMBINATION: A SEAL HOUSING A STUFFING BOX FORMED THEREIN; A CYLINDRICAL MEMBER EXTENDING THROUGH SAID STUFFING BOX; AT LEAST ONE OF SAID HOUSING AND SAID CYLINDRICAL MEMBER BEING MOVABLE WITH RESPECT TO THE OTHER; A BACK-UP RING POSITIONED IN SAID STUFFING BOX FOR CONTACTING A FIRST SURFACE IN SAID STUFFING BOX AND AN ADJACENT SURFACE OF SAID CYLINDRICAL MEMBER; A PRIMARY SEAL RING SUPPORTED FOR CONTACT WITH SAID ADJACENT SURFACE INWARDLY OF SAID BACKUP RING TOWARD A SOURCE OF PRESSURE BETWEEN SAID HOUSING AND SAID CYLINDRICAL MEMBER; SECONDARY SEAL RING MEANS SUPPORTED AROUND AND ENGAGEABLE WITH SAID PRIMARY SEAL RING AND A SECOND SURFACE OF SAID STUFFING BOX; MEANS BIASING SAID SECONDARY SEAL RING MEANS FOR MOVEMENT WITH RESPECT TO SAID PRIMARY SEAL RING AND SAID STUFFING BOX AWAY FROM SAID PRESSURE SOURCE; WEDGE MEANS ON SAID PRIMARY SEAL RING AND SAID SECONDARY SEAL RING MEANS ENGAGEABLE UPON SUCH MOVEMENT OF SAID SECONDARY SEAL RING MEANS WITH RESPECT TO SAID PRIMARY SEAL
References Cited (Backward Citations)
FR1193987A
Cited
US718008A
Cited
GB446869A
Cited
US2807484A
Cited
GB710374A
Cited
US2765204A
Cited
US2963304A
Cited
US3172670A
Cited
US3218087A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-05-07 | 1971-11-06 | 1972-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-07 | 1975-11-06 | 1976-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-07 | 1979-11-06 | 1980-05-07 | $7700.00 | Window Closed / Lapsed |