Patent US3536611A successfully refreshed from Google Patents.
US3536611A
Expired / Lapsed
US
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Membrane device and method
Assignee: Kovalus Separation Solutions LLC
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Filing: 1967-02-06
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Granted: 1970-10-27
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Expires: 1987-02-06
Abstract
No abstract record available.
Inventors
- 👤 Richard P De Filippi
- 👤 Russell W Pierce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:07
CPC Classifications
B; B01; B01D; B01D63/00; B01D63/02; B01D63/033
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2734592A
Cited
US2911057A
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US3228876A
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US3262251A
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US3226915A
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US3276996A
Cited
US3422008A
Cited
US3342729A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-26 | 1974-04-27 | 1974-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-26 | 1978-04-27 | 1978-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-26 | 1982-04-27 | 1982-10-27 | $7700.00 | Window Closed / Lapsed |