Patent US2900645A successfully refreshed from Google Patents.
US2900645A
Expired / Lapsed
US
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Means for preventing condensation on flush-tanks
Assignee: Individual
•
Filing: 1951-04-06
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Granted: 1959-08-25
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Expires: 1971-04-06
Abstract
No abstract record available.
Inventors
- 👤 Norman F Rom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:56
CPC Classifications
E; E03; E03D; E03D1/00; E03D1/006; Y; Y10; Y10T; Y10T137/00; Y10T137/1842; Y10T137/1939; Y10T137/6416; Y10T137/6497
Claims Analysis
Total Claims: 0
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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) | 1962-08-24 | 1963-02-23 | 1963-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-24 | 1967-02-23 | 1967-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-24 | 1971-02-23 | 1971-08-25 | $7700.00 | Window Closed / Lapsed |