Patent US1888720A successfully refreshed from Google Patents.
US1888720A
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US
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Recuperative furnace construction
Assignee: Siemens Industry Inc
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Filing: 1930-05-27
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Granted: 1932-11-22
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Expires: 1950-05-27
Abstract
No abstract record available.
Inventors
- 👤 Jerome R George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:56
CPC Classifications
F; F23; F23L; F23L15/00; F23L15/04; F23J; F23J13/00; F23J13/04; F23J2213/00; F23J2213/20; F23J2213/202; Y; Y02; Y02E; Y02E20/00; Y02E20/34; Y10; Y10S; Y10S165/00; Y10S165/051; Y10S165/052; Y10S165/067; Y10S165/068
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) | 1935-11-22 | 1936-05-23 | 1936-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-11-22 | 1940-05-23 | 1940-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-11-22 | 1944-05-23 | 1944-11-22 | $7700.00 | Window Closed / Lapsed |