US3407870A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recuperative type heat exchanger
Assignee: RUDOLF ERNST BRAUNE
•
Filing: 1966-11-07
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Granted: 1968-10-29
•
Expires: 1986-11-07
Abstract
No abstract record available.
Inventors
- 👤 Braune Rudolf Ernst
- 👤 Sanderson Karl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:15
CPC Classifications
F; F28; F28D; F28D21/00; F28D21/0001; F28D21/0003; F28D21/0005; F28D21/0008; C; C21; C21B; C21B9/00; C21B9/10; Y; Y10; Y10S; Y10S165/00; Y10S165/051; Y10S165/052; Y10S165/07
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA624749A
Cited
US2468903A
Cited
US2942855A
Cited
US3189086A
Cited
US3185210A
Cited
US3187808A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-10-29 | 1972-04-29 | 1972-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-29 | 1976-04-29 | 1976-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-29 | 1980-04-29 | 1980-10-29 | $7700.00 | Window Closed / Lapsed |