US1471832A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of separating the constituents of air and other gaseous mixtures
Assignee: Research Corp
•
Filing: 1920-07-07
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Granted: 1923-10-23
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Expires: 1940-07-07
Abstract
No abstract record available.
Inventors
- 👤 Harvey N Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:18
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/04; Y; Y10; Y10S; Y10S62/00; Y10S62/902; Y10S62/905
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) | 1926-10-22 | 1927-04-23 | 1927-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1930-10-22 | 1931-04-23 | 1931-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1934-10-22 | 1935-04-23 | 1935-10-23 | $7700.00 | Window Closed / Lapsed |