US1962525A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of purifying gases
Assignee: Chemical Engineering Corp
•
Filing: 1931-06-16
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Granted: 1934-06-12
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Expires: 1951-06-16
Abstract
No abstract record available.
Inventors
- 👤 Ralph S Richardson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:00
CPC Classifications
C; C01; C01B; C01B3/00; C01B3/02; C01B3/025; C01B3/50; C01B3/506; C01B2203/00; C01B2203/04; C01B2203/0465; C01B2203/047; C01B2203/0475
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) | 1937-06-11 | 1937-12-11 | 1938-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-06-11 | 1941-12-11 | 1942-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-06-11 | 1945-12-11 | 1946-06-12 | $7700.00 | Window Closed / Lapsed |