US3472765A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Membrane separation in biological-reactor systems
Assignee: Dorr Oliver Inc
•
Filing: 1968-06-10
•
Granted: 1969-10-14
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Expires: 1988-06-10
Abstract
No abstract record available.
Inventors
- 👤 William E Budd
- 👤 Robert W Okey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:22
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/02; B01D61/025; C; C02; C02F; C02F3/00; C02F3/02; C02F3/12; C12; C12M; C12M29/00; C12M29/18; C12M33/00; C12M33/14; C12M41/00; C12M41/30; C12M41/36; Y; Y02; Y02W; Y02W10/00; Y02W10/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3188288A
Cited
US3186917A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-13 | 1973-04-14 | 1973-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-13 | 1977-04-14 | 1977-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-13 | 1981-04-14 | 1981-10-14 | $7700.00 | Window Closed / Lapsed |