US3488039A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter bed for dust collector
Assignee: National Dust Collector Corp
•
Filing: 1968-05-20
•
Granted: 1970-01-06
•
Expires: 1988-05-20
Abstract
No abstract record available.
Inventors
- 👤 Frank Ekman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:05
CPC Classifications
B; B01; B01D; B01D50/00; B01D46/00; B01D46/30; B01D46/32; Y; Y10; Y10S; Y10S261/00; Y10S261/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE116167C
Cited
US2253261A
Cited
US3032868A
Cited
US2907404A
Cited
US3141910A
Cited
US3181287A
Cited
US3332214A
Cited
US3348825A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-05 | 1973-07-07 | 1974-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-05 | 1977-07-07 | 1978-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-05 | 1981-07-07 | 1982-01-06 | $7700.00 | Window Closed / Lapsed |