US2937855A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recuperator structures
Assignee: Individual
•
Filing: 1958-09-11
•
Granted: 1960-05-24
•
Expires: 1978-09-11
Abstract
No abstract record available.
Inventors
- 👤 Frank D Hazen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:03
CPC Classifications
F; F28; F28D; F28D7/00; F28D7/10; F28D7/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US92526A
Cited
US2294162A
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FR19595E
Cited
GB209993A
Cited
US1759133A
Cited
GB514345A
Cited
FR841618A
Cited
US2332450A
Cited
US2446932A
Cited
FR928633A
Cited
US2706106A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-24 | 1963-11-23 | 1964-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-24 | 1967-11-23 | 1968-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-24 | 1971-11-23 | 1972-05-24 | $7700.00 | Window Closed / Lapsed |