US2997031A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of heating and generating steam
Assignee: Combustion Engineering Inc
•
Filing: 1955-12-12
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Granted: 1961-08-22
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Expires: 1975-12-12
Abstract
No abstract record available.
Inventors
- 👤 Richard C Ulmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:34
CPC Classifications
F; F23; F23C; F23C13/00; B; B01; B01J; B01J8/00; B01J8/18; B01J8/1836; B01J8/24; B01J8/26; B01J8/28; F22; F22B; F22B31/00; F22B31/0007; F22B31/0015; F22B31/0023; F23C10/00; B01J2208/00; B01J2208/00008; B01J2208/00017; B01J2208/00026; B01J2208/00035; B01J2208/00088; B01J2208/00106; B01J2208/00115; B01J2208/00141; B01J2208/00477; B01J2208/00495; B01J2208/0053
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2729428A
Cited
US2750258A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-21 | 1965-02-20 | 1965-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-21 | 1969-02-20 | 1969-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-21 | 1973-02-20 | 1973-08-22 | $7700.00 | Window Closed / Lapsed |