US2157751A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Marine boiler
Assignee: Combustion Engineering Inc
•
Filing: 1936-02-26
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Granted: 1939-05-09
•
Expires: 1956-02-26
Abstract
No abstract record available.
Inventors
- 👤 Horace T Dyer
- 👤 John A Barnes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:13
CPC Classifications
F; F22; F22B; F22B21/00; F22B21/02; F22B21/04; F22B21/08; F22B21/081; B; B01; B01J; B01J47/00; B01J47/012
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) | 1942-05-08 | 1942-11-07 | 1943-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-05-08 | 1946-11-07 | 1947-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-05-08 | 1950-11-07 | 1951-05-09 | $7700.00 | Window Closed / Lapsed |