US3395728A
Expired / Lapsed
US
⏱️ 0.0 years remaining
One way seal
Assignee: Otis Engineering Corp
•
Filing: 1965-09-10
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Granted: 1968-08-06
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Expires: 1985-09-10
Abstract
No abstract record available.
Inventors
- 👤 Jack W Tamplen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:17
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/12; F; F16; F16K; F16K15/00; F16K15/14; F16K15/141; F16K15/142
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
A ONE-WAY SEAL DEVICE INCLUDING: A CENTRAL MEMBER; AN ANNULAR MEMBER SURROUNDING SAID CENTRAL MEMBER AND SPACED THEREFROM TO PROVIDE A FLOW PASSAGE THEREBETWEEN; AN ANNULAR RECESS MEANS IN ONE OF SAID MEMBERS OPENING TO SAID ANNULAR FLOW PASSAGE BETWEEN SAID MEMBERS; AN O-RING DISPOSED IN SAID RECESS AND ENGAGEABLE WITH ONE WALL SURFACE OF SAID MEMBER HAVING THE RECESS THEREIN ADJACENT SAID ANNULAR SPACE BETWEEN THE MEMBERS AND ENGAGEABLE WITH THE ADJACENT SURFACE OF THE OUTER MEMBER TO SEAL THEREBETWEEN; AND A FLOW PASSING MEMBER DISPOSED IN SAID RECESS AND HAVING PLANAR SUPPORTING SUR-
Claim 2
Dependent Claim
95 words
A ONE-WAY SEAL DEVICE INCLUDING: A CENTRAL MEMBER; AN ANNULAR MEMBER SURROUNDING SAID CENTRAL MEMBER AND SPACED THEREFROM TO PROVIDE A FLOW PASSAGE THEREBETWEEN; AN ANNULAR RECESS MEANS IN ONE OF SAID MEMBERS OPENING TO SAID ANNULAR FLOW PASSAGE BETWEEN SAID MEMBERS; AN O-RING DISPOSED IN SAID RECESS AND ENGAGEABLE WITH ONE WALL SURFACE OF SAID MEMBER HAVING THE RECESS THEREIN ADJACENT SAID ANNULAR SPACE BETWEEN THE MEMBERS AND ENGAGEABLE WITH THE ADJACENT SURFACE OF THE OUTER MEMBER TO SEAL THEREBETWEEN; AND A FLOW PASSING MEMBER DISPOSED IN SAID RECESS AND HAVING PLANAR SUPPORTING SUR-
References Cited (Backward Citations)
US2614793A
Cited
US2872221A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-08-06 | 1972-02-05 | 1972-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-06 | 1976-02-05 | 1976-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-06 | 1980-02-05 | 1980-08-06 | $7700.00 | Window Closed / Lapsed |