US3443364A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dust collector
Assignee: Bituminous Coal Research Inc
•
Filing: 1966-12-09
•
Granted: 1969-05-13
•
Expires: 1986-12-09
Abstract
No abstract record available.
Inventors
- 👤 Robert D Saltsman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:53
CPC Classifications
B; B01; B01D; B01D45/00; B01D45/12; B01D47/00; B01D47/06; B01D45/16; B01D50/00; B01D50/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-12 | 1972-11-11 | 1973-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-12 | 1976-11-11 | 1977-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-12 | 1980-11-11 | 1981-05-13 | $7700.00 | Window Closed / Lapsed |