Patent US2937855A successfully refreshed from Google Patents.
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 19:26
CPC Classifications
F; F28; F28D; F28D7/00; F28D7/10; F28D7/12
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US92526A
Cited
US2294162A
Cited
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 |