Patent US2991042A successfully refreshed from Google Patents.
US2991042A
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Fail-safe through-conduit gate valve
Assignee: ACF Industries Inc
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Filing: 1957-07-19
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Granted: 1961-07-04
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Expires: 1977-07-19
Abstract
No abstract record available.
Inventors
- 👤 Paul J Natho
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:06
CPC Classifications
F; F16; F16K; F16K3/00; F16K3/02; F16K3/0254; F16K31/00; F16K31/12; F16K31/14; F16K31/143
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US630067A
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US798551A
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US966672A
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US1039340A
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US1819043A
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US1926529A
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US1861916A
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US2161175A
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US2541968A
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US2698157A
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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 |