Patent US1901389A successfully refreshed from Google Patents.
US1901389A
Expired / Lapsed
US
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Process for liquefying and rectifying air
Assignee: Individual
•
Filing: 1929-10-09
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Granted: 1933-03-14
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Expires: 1949-10-09
Abstract
No abstract record available.
Inventors
- 👤 Hazard-Flamand Maurice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:05
CPC Classifications
F; F25; F25J; F25J1/00; F25J1/02; F25J1/0203; F25J1/0208; F25J1/0002; F25J1/0012; F25J1/003; F25J1/0032; F25J1/0035; F25J1/0037; F25J1/004; F25J3/00; F25J3/02; F25J3/04; F25J2270/00; F25J2270/90
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1936-03-13 | 1936-09-12 | 1937-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-03-13 | 1940-09-12 | 1941-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-03-13 | 1944-09-12 | 1945-03-14 | $7700.00 | Window Closed / Lapsed |