US2998962A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cylindrical radiation recuperator with upper and lower air distributor
Assignee: IND CO KLEINEWEFERS KONST
•
Filing: 1958-09-08
•
Granted: 1961-09-05
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Expires: 1978-09-08
Abstract
No abstract record available.
Inventors
- 👤 Friedbert M Heyn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:19
CPC Classifications
F; F28; F28F; F28F9/00; F28F9/001; Y; Y10; Y10S; Y10S165/00; Y10S165/051; Y10S165/052; Y10S165/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2051323A
Cited
US1220270A
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US1766608A
Cited
US2156063A
Cited
US2180128A
Cited
US2232936A
Cited
US2806677A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-09-04 | 1965-03-06 | 1965-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-04 | 1969-03-06 | 1969-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-04 | 1973-03-06 | 1973-09-05 | $7700.00 | Window Closed / Lapsed |