US3477575A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of continuous dynamic filtration and an apparatus for carrying out the same
Assignee: VVZKUMNY USTAV ORGANICKYCH SYN
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Filing: 1967-12-19
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Granted: 1969-11-11
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Expires: 1987-12-19
Abstract
No abstract record available.
Inventors
- 👤 Jindrich Nemec
- 👤 Jan Kaspar
- 👤 Josef Soudek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:40
CPC Classifications
B; B01; B01D; B01D33/00; B01D33/15; B01D33/21; B01D29/00; B01D29/39; B01D29/50; B01D29/52; B01D29/54; B01D29/60; B01D29/76; B01D29/86; B01D29/88; B01D29/94; B01D29/945; B01D33/35; B01D33/37; B01D33/39; B01D33/70; B01D33/72; B01D33/722; B01D33/76; B01D33/763; B01D33/80; B01D33/804; B01D37/00; B01D37/02; B01D37/04
Claims Analysis
Total Claims: 0
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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) | 1972-11-10 | 1973-05-12 | 1973-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-10 | 1977-05-12 | 1977-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-10 | 1981-05-12 | 1981-11-11 | $7700.00 | Window Closed / Lapsed |