US2840337A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve structure for tanks
Assignee: PENNSYLVANIA FURNACE AND IRON
•
Filing: 1954-07-01
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Granted: 1958-06-24
•
Expires: 1974-07-01
Abstract
No abstract record available.
Inventors
- 👤 Curtis F Sasserson
- 👤 Harold A Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:18
CPC Classifications
C; C10; C10C; C10C3/00; C10C3/10; C10C3/12; F; F16; F16K; F16K1/00; F16K1/32; F16K1/34; F16K1/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2069588A
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US2192339A
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US2479688A
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GB580774A
Cited
US2446767A
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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) | 1961-06-23 | 1961-12-23 | 1962-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-23 | 1965-12-23 | 1966-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-23 | 1969-12-23 | 1970-06-24 | $7700.00 | Window Closed / Lapsed |