Patent US3159234A successfully refreshed from Google Patents.
US2115548A
Expired / Lapsed
US
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Heating
Assignee: Foster Wheeler Inc
•
Filing: 1935-04-27
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Granted: 1938-04-26
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Expires: 1955-04-27
Abstract
No abstract record available.
Inventors
- 👤 Nicholas C Artsay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:26
CPC Classifications
F; F22; F22B; F22B1/00; F22B1/02; F22B1/08; F22B1/12; F23; F23N; F23N1/00
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) | 1941-04-25 | 1941-10-25 | 1942-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1945-04-25 | 1945-10-25 | 1946-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1949-04-25 | 1949-10-25 | 1950-04-26 | $7700.00 | Window Closed / Lapsed |