US2425850A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Free piston type internal-combustion compressor
Assignee: English Electric Co Ltd
•
Filing: 1945-09-04
•
Granted: 1947-08-19
•
Expires: 1965-09-04
Abstract
No abstract record available.
Inventors
- 👤 Welsh Robert James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 00:36
CPC Classifications
F; F02; F02B; F02B71/00; F02B71/04; F02M; F02M49/00; F02M49/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE281566C
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GB237642A
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GB301079A
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US2076258A
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US2038442A
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US2090709A
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US2147935A
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US2168828A
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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) | 1950-08-18 | 1951-02-17 | 1951-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-08-18 | 1955-02-17 | 1955-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-08-18 | 1959-02-17 | 1959-08-19 | $7700.00 | Window Closed / Lapsed |