Patent US3396974A successfully refreshed from Google Patents.
US3396974A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bell and spigot pipe joints and method of sealing and locking pipe joints
Assignee: Forsheda Gummifabrik AB
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Filing: 1966-11-14
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Granted: 1968-08-13
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Expires: 1986-11-14
Abstract
No abstract record available.
Inventors
- 👤 Nord Sten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:29
CPC Classifications
F; F16; F16L; F16L21/00; F16L21/02; F16L21/025
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
IN A BELL AND SPIGOT PIPE JOINT OF THE CLASS WHERE A SEALING RING OF ELASTIC MATERIAL IS COMPRESSED TO A FORMED STATE BETWEEN THE OPPOSED SUBSTANTIALLY CYLINDER SURFACES OF THE BELL AND SPIGOT BY ROLLING SAID SEALING RING ALONG SAID SURFACES INTO SEALING POSITION AS THE SPIGOT IS THRUST INTO THE BELL UNTIL IT IS SEALED THEREIN: THE COMBINATION WITH SAID BELL AND SPIGOT OF A SEALING RING OF ELASTIC MATERIAL OF SUBSTANTIALLY CIRCULAR CROSSSECTION WHOSE INNER DIAMETER IS LESS THAN THE OUTER DIAMETER OF SAID SPIGOT AND WHICH IS PROVIDED WITH A POINTED INTEGRAL PROJECTION WHOSE SIDES ARE TANGENTS
Claim 2
Dependent Claim
101 words
IN A BELL AND SPIGOT PIPE JOINT OF THE CLASS WHERE A SEALING RING OF ELASTIC MATERIAL IS COMPRESSED TO A FORMED STATE BETWEEN THE OPPOSED SUBSTANTIALLY CYLINDER SURFACES OF THE BELL AND SPIGOT BY ROLLING SAID SEALING RING ALONG SAID SURFACES INTO SEALING POSITION AS THE SPIGOT IS THRUST INTO THE BELL UNTIL IT IS SEALED THEREIN: THE COMBINATION WITH SAID BELL AND SPIGOT OF A SEALING RING OF ELASTIC MATERIAL OF SUBSTANTIALLY CIRCULAR CROSSSECTION WHOSE INNER DIAMETER IS LESS THAN THE OUTER DIAMETER OF SAID SPIGOT AND WHICH IS PROVIDED WITH A POINTED INTEGRAL PROJECTION WHOSE SIDES ARE TANGENTS
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-08-13 | 1972-02-12 | 1972-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-13 | 1976-02-12 | 1976-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-13 | 1980-02-12 | 1980-08-13 | $7700.00 | Window Closed / Lapsed |