US2490840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas purification process
Assignee: Beazer East Inc
•
Filing: 1944-07-11
•
Granted: 1949-12-13
•
Expires: 1964-07-11
Abstract
No abstract record available.
Inventors
- 👤 Joseph A Shaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:06
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/14; B01D53/1456; C; C10; C10K; C10K1/00; C10K1/08; C10K1/085; C10K1/10; C10K1/12; C10K1/14; C10K1/143; C10K1/16; B01D2257/00; B01D2257/30; Y; Y02; Y02P; Y02P20/00; Y02P20/151
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-12 | 1953-06-13 | 1953-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-12 | 1957-06-13 | 1957-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-12 | 1961-06-13 | 1961-12-13 | $7700.00 | Window Closed / Lapsed |