US2497047A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Center-weighted floating roof
Assignee: Graver Energy Systems Inc
•
Filing: 1948-12-24
•
Granted: 1950-02-07
•
Expires: 1968-12-24
Abstract
No abstract record available.
Inventors
- 👤 Frank D Prager
- 👤 Reign C Ulm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:08
CPC Classifications
B; B65; B65D; B65D88/00; B65D88/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1463268A
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US1994478A
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US1592244A
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US2071530A
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US2056857A
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US2089645A
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US2193484A
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US2430592A
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US2425771A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-02-06 | 1953-08-08 | 1954-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-06 | 1957-08-08 | 1958-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-06 | 1961-08-08 | 1962-02-07 | $7700.00 | Window Closed / Lapsed |