US3491887A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solvent filter particularly designed for dry-cleaning plants
Assignee: Individual
•
Filing: 1967-12-14
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Granted: 1970-01-27
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Expires: 1987-12-14
Abstract
No abstract record available.
Inventors
- 👤 Gino Maestrelli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:36
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/39; B01D29/395; B01D29/44; B01D29/48; B01D29/50; B01D29/52; B01D29/54; B01D29/62; B01D29/70; B01D2201/00; B01D2201/04; B01D2201/0469
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) | 1973-01-26 | 1973-07-28 | 1974-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-26 | 1977-07-28 | 1978-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-26 | 1981-07-28 | 1982-01-27 | $7700.00 | Window Closed / Lapsed |