US3147014A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foam gasket joint for concrete pipe and method of making same
Assignee: American Pipe and Construction Co
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Filing: 1962-07-20
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Granted: 1964-09-01
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Expires: 1982-07-20
Abstract
No abstract record available.
Inventors
- 👤 Burl B Ohnstad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:18
CPC Classifications
F; F16; F16L; F16L21/00; F16L21/02; F16L21/025
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
IN A JOINT FOR CONCRETE PIPE SECTIONS AND THE LIKE, A PAIR OF PIPE SECTIONS HAVING INTERFITTING END PORTIONS, AN ANNULAR GASKET COMPRESSED BETWEEN SAID INTERFITTING END PORTIONS, SAID GASKET BEING FORMED OF A MATERIAL CHOSEN FROM THE CLASS CONSISTING OF FOAM RUBBER AND FOAM PLASTICS AND CHARACTERIZED AS HAVING A CLOSED-CELL STRUCTURE, SAID GASKET HAVING A RUPTURED CELL SURFACE THROUGHOUT AN ANNULAR AREA ADJACENT THE SURFACE OF THE END PORTION OF ONE OF SAID PIPE SECTIONS, AND A BONDING AGENT SECURELY AFFIXING SAID GASKET TO AN END PORTION OF ONE OF SAID PIPE SECTIONS, SAID BONDING AGENT COVERING THE SURFACE AREA OF RUPTURED CELL STRUCTURE OF THE GASKET AND PENETRATING THE RUPTURED CELLS THEREOF.
Claim 2
Dependent Claim
115 words
IN A JOINT FOR CONCRETE PIPE SECTIONS AND THE LIKE, A PAIR OF PIPE SECTIONS HAVING INTERFITTING END PORTIONS, AN ANNULAR GASKET COMPRESSED BETWEEN SAID INTERFITTING END PORTIONS, SAID GASKET BEING FORMED OF A MATERIAL CHOSEN FROM THE CLASS CONSISTING OF FOAM RUBBER AND FOAM PLASTICS AND CHARACTERIZED AS HAVING A CLOSED-CELL STRUCTURE, SAID GASKET HAVING A RUPTURED CELL SURFACE THROUGHOUT AN ANNULAR AREA ADJACENT THE SURFACE OF THE END PORTION OF ONE OF SAID PIPE SECTIONS, AND A BONDING AGENT SECURELY AFFIXING SAID GASKET TO AN END PORTION OF ONE OF SAID PIPE SECTIONS, SAID BONDING AGENT COVERING THE SURFACE AREA OF RUPTURED CELL STRUCTURE OF THE GASKET AND PENETRATING THE RUPTURED CELLS THEREOF.
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) | 1967-09-01 | 1968-03-02 | 1968-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-01 | 1972-03-02 | 1972-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-01 | 1976-03-02 | 1976-09-01 | $7700.00 | Window Closed / Lapsed |