Patent US2539744A successfully refreshed from Google Patents.
US2539744A
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US
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Plant for the production of compressed air
Assignee: Aktiengesellschaft fuer Technische Studien
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Filing: 1945-08-08
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Granted: 1951-01-30
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Expires: 1965-08-08
Abstract
No abstract record available.
Inventors
- 👤 Keller Curt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 05:58
CPC Classifications
F; F02; F02C; F02C3/00; F02C3/20; F02C3/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1702264A
Cited
FR601964A
Cited
GB292292A
Cited
US2159849A
Cited
US2098803A
Cited
US2163762A
Cited
US2305785A
Cited
US2354213A
Cited
US2457594A
Cited
US2379452A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-29 | 1954-07-31 | 1955-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-29 | 1958-07-31 | 1959-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-29 | 1962-07-31 | 1963-01-30 | $7700.00 | Window Closed / Lapsed |