US2650738A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Floating roof
Assignee: Graver Energy Systems Inc
•
Filing: 1952-11-12
•
Granted: 1953-09-01
•
Expires: 1972-11-12
Abstract
No abstract record available.
Inventors
- 👤 Reign C Ulm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:15
CPC Classifications
B; B65; B65D; B65D88/00; B65D88/34; B65D88/42; B65D88/46
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2212326A
Cited
US2471635A
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US2478422A
Cited
US2554497A
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US2587508A
Cited
US2600237A
Cited
US2542444A
Cited
US2611501A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-31 | 1957-03-02 | 1957-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-31 | 1961-03-02 | 1961-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-31 | 1965-03-02 | 1965-09-01 | $7700.00 | Window Closed / Lapsed |