US3430419A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for reverse air cleaning of dust collectors
Assignee: National Gypsum Co
•
Filing: 1967-05-03
•
Granted: 1969-03-04
•
Expires: 1987-05-03
Abstract
No abstract record available.
Inventors
- 👤 Paul W Reinecke
- 👤 Ronald L Van Sipe
- 👤 Walter W Dowd
- 👤 Donald O Liske
- 👤 Daniel J Betoski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:49
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/66; B01D46/70; B01D46/71; B01D46/02; B01D46/04; B01D46/42; B01D46/4272
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1509912A
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US1628601A
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US1784339A
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US2576656A
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US3209521A
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US3107386A
Cited
US3097938A
Cited
US3277633A
Cited
US3269096A
Cited
US3332217A
Cited
US3332218A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-03-03 | 1972-09-02 | 1973-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-03 | 1976-09-02 | 1977-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-03 | 1980-09-02 | 1981-03-04 | $7700.00 | Window Closed / Lapsed |