US3533221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxygen concentration process
Assignee: Individual
•
Filing: 1968-12-26
•
Granted: 1970-10-13
•
Expires: 1988-12-26
Abstract
No abstract record available.
Inventors
- 👤 Takaaki Tamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:12
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/02; B01D53/04; B01D53/047; B01D53/0476; C; C01; C01B; C01B13/00; C01B13/02; C01B13/0229; C01B13/0248; C01B13/0259; B01D2253/00; B01D2253/10; B01D2253/104; B01D2253/106; B01D2253/108; B01D2253/112; B01D2253/1124; B01D2256/00; B01D2256/12; B01D2257/00; B01D2257/10; B01D2257/102; B01D2257/50; B01D2257/504; B01D2257/80; B01D2259/00; B01D2259/40; B01D2259/40001; B01D2259/40011; B01D2259/40043; B01D2259/4005; B01D2259/40052; B01D2259/40056; B01D2259/40058; B01D2259/4006; B01D2259/40062; B01D2259/40077; B01D2259/40081; B01D2259/40083; B01D2259/40088; B01D53/26; B01D53/261; C01B2210/00; C01B2210/0043; C01B2210/0046; C01B2210/0051; Y; Y02; Y02C; Y02C20/00; Y02C20/40; 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) | 1973-10-12 | 1974-04-13 | 1974-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-12 | 1978-04-13 | 1978-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-12 | 1982-04-13 | 1982-10-13 | $7700.00 | Window Closed / Lapsed |