US3498030A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cleaning devices for gas filtering apparatus
Assignee: JOHN L WILKI
•
Filing: 1967-11-01
•
Granted: 1970-03-03
•
Expires: 1987-11-01
Abstract
No abstract record available.
Inventors
- 👤 John L Wilki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:58
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/02; B01D46/04; B01D46/66; B01D46/70; B01D46/71
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3123132A
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US1127242A
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US2804168A
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US2765048A
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US2980207A
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US2850112A
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US2976953A
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US3167415A
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US2974748A
Cited
US3377783A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-02 | 1973-09-01 | 1974-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-02 | 1977-09-01 | 1978-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-02 | 1981-09-01 | 1982-03-03 | $7700.00 | Window Closed / Lapsed |