US1375932A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of hydrogen
Assignee: Individual
•
Filing: 1919-02-11
•
Granted: 1921-04-26
•
Expires: 1939-02-11
Abstract
No abstract record available.
Inventors
- 👤 Rideal Eric Keightley
- 👤 Taylor Hugh Stott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:01
CPC Classifications
C; C01; C01B; C01B3/00; C01B3/50; C01B3/56; C01B3/58; C01B3/583; C01B3/02; C01B3/06; C01B3/12; C01B3/16; C01B2203/00; C01B2203/04; C01B2203/0435; C01B2203/044; 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) | 1924-04-25 | 1924-10-25 | 1925-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1928-04-25 | 1928-10-25 | 1929-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1932-04-25 | 1932-10-25 | 1933-04-26 | $7700.00 | Window Closed / Lapsed |