US1923656A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat recovery system
Assignee: EIDP Inc
•
Filing: 1930-12-08
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Granted: 1933-08-22
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Expires: 1950-12-08
Abstract
No abstract record available.
Inventors
- 👤 John S Beekley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:46
CPC Classifications
C; C01; C01B; C01B3/00; C01B3/02; C01B3/32; C01B3/34; C01B3/48; C01B2203/00; C01B2203/02; C01B2203/0205; C01B2203/0227; C01B2203/0233; C01B2203/0283; C01B2203/08; C01B2203/0805; C01B2203/0838; C01B2203/0844; C01B2203/12; C01B2203/1258; C01B2203/14; C01B2203/148
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1936-08-21 | 1937-02-20 | 1937-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-08-21 | 1941-02-20 | 1941-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-08-21 | 1945-02-20 | 1945-08-22 | $7700.00 | Window Closed / Lapsed |