Patent US2420840A successfully refreshed from Google Patents.
US2420840A
Expired / Lapsed
US
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Gas purifier and compressor
Assignee: Individual
•
Filing: 1945-06-28
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Granted: 1947-05-20
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Expires: 1965-06-28
Abstract
No abstract record available.
Inventors
- 👤 Piquerez Emile
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:50
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/70; F04D29/701; B; B01; B01D; B01D45/00; B01D45/12; B01D45/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-05-19 | 1950-11-18 | 1951-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-05-19 | 1954-11-18 | 1955-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-05-19 | 1958-11-18 | 1959-05-20 | $7700.00 | Window Closed / Lapsed |