Patent US3079834A successfully refreshed from Google Patents.
Patent US2850260A successfully refreshed from Google Patents.
US2850260A
Expired / Lapsed
US
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Gate valve
Assignee: Vacuum Research Co
•
Filing: 1954-08-23
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Granted: 1958-09-02
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Expires: 1974-08-23
Abstract
No abstract record available.
Inventors
- 👤 Perazone Hugh Lewis
- 👤 Guthrie Andrew
- 👤 Ernest A Martinelli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:34
CPC Classifications
F; F16; F16K; F16K3/00; F16K3/02; F16K3/16; F16K3/18; F16K3/182; F16K31/00; F16K31/44; F16K31/52; F16K31/523
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2204142A
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US2640677A
Cited
US2713989A
Cited
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Cited
US2718372A
Cited
FR1095876A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-01 | 1962-03-03 | 1962-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-01 | 1966-03-03 | 1966-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-01 | 1970-03-03 | 1970-09-02 | $7700.00 | Window Closed / Lapsed |