Patent US2991092A successfully refreshed from Google Patents.
US2991092A
Expired / Lapsed
US
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Pipe coupling having a double sealing action gasket
Assignee: American Cast Iron Pipe Co
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Filing: 1957-07-05
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Granted: 1961-07-04
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Expires: 1977-07-05
Abstract
No abstract record available.
Inventors
- 👤 Jack W Mackay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:27
CPC Classifications
F; F16; F16L; F16L17/00; F16L17/02; F16L17/03; F16L17/035
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1758455A
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US1979141A
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US1955832A
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US2116705A
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GB469480A
Cited
US2245154A
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US2519436A
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US2589876A
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US2953398A
Cited
US2966539A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-03 | 1965-01-02 | 1965-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-03 | 1969-01-02 | 1969-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-03 | 1973-01-02 | 1973-07-04 | $7700.00 | Window Closed / Lapsed |