US2547589A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for extracting heat from gases under pressure
Assignee: Combustion Engineering Inc
•
Filing: 1947-07-02
•
Granted: 1951-04-03
•
Expires: 1967-07-02
Abstract
No abstract record available.
Inventors
- 👤 Leonard J Marshall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:58
CPC Classifications
F; F22; F22B; F22B1/00; F22B1/02; F22B1/18; F22B1/1823; F22B1/1838; F22B21/00; F22B21/22; F22B21/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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GB426516A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-02 | 1954-10-02 | 1955-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-02 | 1958-10-02 | 1959-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-02 | 1962-10-02 | 1963-04-03 | $7700.00 | Window Closed / Lapsed |