US2214790A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for separating gases
Assignee: EIDP Inc
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Filing: 1935-07-05
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Granted: 1940-09-17
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Expires: 1955-07-05
Abstract
No abstract record available.
Inventors
- 👤 Crawford H Greenewalt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:04
CPC Classifications
B; B01; B01D; B01D3/00; B01D3/14; B01D3/143; F; F25; F25J; F25J3/00; F25J3/02; C; C07; C07C; C07C7/00; C07C7/04; F25J3/0204; F25J3/0219; F25J3/0228; F25J3/0233; F25J3/0238; F25J3/0242; F25J3/0252; F25J2200/00; F25J2200/40; F25J2200/50; F25J2200/74; F25J2200/76; F25J2210/00; F25J2210/12; F25J2215/00; F25J2215/62; F25J2230/00; F25J2230/30; F25J2270/00; F25J2270/02; F25J2270/88
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) | 1943-09-17 | 1944-03-18 | 1944-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-09-17 | 1948-03-18 | 1948-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-09-17 | 1952-03-18 | 1952-09-17 | $7700.00 | Window Closed / Lapsed |