US3388535A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-supported filter
Assignee: Viskon-Aire Corp
•
Filing: 1965-02-16
•
Granted: 1968-06-18
•
Expires: 1985-02-16
Abstract
No abstract record available.
Inventors
- 👤 Lawrence M Nash
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:35
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2138736A
Cited
US2124370A
Cited
US2576864A
Cited
US2521984A
Cited
US2751039A
Cited
US2812038A
Cited
US2865466A
Cited
US3017698A
Cited
US3017239A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-06-18 | 1971-12-18 | 1972-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-18 | 1975-12-18 | 1976-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-18 | 1979-12-18 | 1980-06-18 | $7700.00 | Window Closed / Lapsed |