US2564548A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid piston air compressor
Assignee: Individual
•
Filing: 1947-12-03
•
Granted: 1951-08-14
•
Expires: 1967-12-03
Abstract
No abstract record available.
Inventors
- 👤 Sjoberg Edvin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 07:13
CPC Classifications
F; F04; F04B; F04B39/00; F04B39/0005; F04B39/0011
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR523281A
Cited
US2077832A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-08-13 | 1955-02-12 | 1955-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-08-13 | 1959-02-12 | 1959-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-08-13 | 1963-02-12 | 1963-08-14 | $7700.00 | Window Closed / Lapsed |