US3558164A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pipe coupling
Assignee: NAT CLAY PIPE INST
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Filing: 1968-12-11
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Granted: 1971-01-26
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Expires: 1988-12-11
Abstract
Abstract A COUPLING FOR PLAIN-END PIPE IS DISCLOSED WHICH COMPRISES A UNITARY SLEEVE OF ELASTOMERIC MATERIAL SUCH AS RUBBER OR URETHANE REINFORCED BY A FLEXIBLE TUBULAR SHEATH OF PLASTIC OR FIBER GLASS. NEAR EACH END OF THE COUPLING, THE INNER SURFACE OF THE ELASTOMERIC SLEEVE IS PROVIDED WITH BEAD PORTIONS TO GRIP AND SEAL THE PIPE. THE INNER PORTION OF THE SLEEVE HAS A CENTRALLY LOCATED ANNULAR RING EXTENDING INWARDLY THEREFROM WHICH MAY BE REMOVABLE AND WHICH SERVES AS A PIPE END STOP.
Inventors
- 👤 Richard F Havell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:35
CPC Classifications
F; F16; F16L; F16L21/00; F16L21/002; F16L21/005
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |