US2902029A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heating apparatus employing submerged secondary combustion chamber
Assignee: International Minerals and Chemical Corp
•
Filing: 1958-04-30
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Granted: 1959-09-01
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Expires: 1978-04-30
Abstract
No abstract record available.
Inventors
- 👤 Frederick J Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:35
CPC Classifications
F; F22; F22B; F22B1/00; F22B1/22; F22B1/26; F22B1/265; B; B01; B01D; B01D1/00; B01D1/14; C; C01; C01B; C01B25/00; C01B25/16; C01B25/18; C01B25/234; C01B25/2343; C01B25/2346
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1769833A
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US2231445A
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US2611362A
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US2594433A
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US2638895A
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AT171908B
Cited
US2781756A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-31 | 1963-03-02 | 1963-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-31 | 1967-03-02 | 1967-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-31 | 1971-03-02 | 1971-09-01 | $7700.00 | Window Closed / Lapsed |