US3494465A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selectively permeable membrane separation apparatus
Assignee: Dorr Oliver Inc
•
Filing: 1968-09-16
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Granted: 1970-02-10
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Expires: 1988-09-16
Abstract
No abstract record available.
Inventors
- 👤 Per Nyrop
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:09
CPC Classifications
B; B01; B01D; B01D63/00; B01D63/08; B01D63/082; B01D2313/00; B01D2313/06; B01D2313/20; B01D2313/205
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2208135A
Cited
US2597907A
Cited
US2958391A
Cited
US3332216A
Cited
US3401798A
Cited
US3398833A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-09 | 1973-08-11 | 1974-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-09 | 1977-08-11 | 1978-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-09 | 1981-08-11 | 1982-02-10 | $7700.00 | Window Closed / Lapsed |