US2947522A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recuperators
Assignee: Individual
•
Filing: 1955-05-12
•
Granted: 1960-08-02
•
Expires: 1975-05-12
Abstract
No abstract record available.
Inventors
- 👤 Keller John Donald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:43
CPC Classifications
F; F28; F28D; F28D21/00; F28D21/0001; F28D21/0003; F28D21/001; F28D7/00; F28D7/08; F28D7/082; F28D7/085; F28D7/087
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2499358A
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US2683590A
Cited
US2650555A
Cited
US2714847A
Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-02 | 1964-02-01 | 1964-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-02 | 1968-02-01 | 1968-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-02 | 1972-02-01 | 1972-08-02 | $7700.00 | Window Closed / Lapsed |