US1546632A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for separating mixed gases
Assignee: Individual
•
Filing: 1922-09-11
•
Granted: 1925-07-21
•
Expires: 1942-09-11
Abstract
No abstract record available.
Inventors
- 👤 Dow Douglas
- 👤 Elijah P Lovejoy
- 👤 Theodore J Case
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:20
CPC Classifications
B; B03; B03C; B03C1/00; B03C1/02; B03C1/035; B03C1/28; B03C1/288; B03C2201/00; B03C2201/16
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) | 1928-07-20 | 1929-01-19 | 1929-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1932-07-20 | 1933-01-19 | 1933-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1936-07-20 | 1937-01-19 | 1937-07-21 | $7700.00 | Window Closed / Lapsed |