US3431709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dust collector
Assignee: Sanko Seisakusho KK
•
Filing: 1967-09-25
•
Granted: 1969-03-11
•
Expires: 1987-09-25
Abstract
No abstract record available.
Inventors
- 👤 Shunpei Kawanami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:07
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/02; B01D46/04; B01D46/0039; B01D46/0041; B01D46/0043; B01D46/42; B01D46/4272; B01D46/56; B01D46/58; B01D46/60; B01D46/66; B01D46/70; B01D46/71; B01D2271/00; B01D2271/02; B01D2271/027
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US337486A
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US1734325A
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US2035592A
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US2338418A
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US2338419A
Cited
US2855100A
Cited
US2976953A
Cited
US3167415A
Cited
US3332217A
Cited
US3349914A
Cited
US3365065A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-03-10 | 1972-09-09 | 1973-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-10 | 1976-09-09 | 1977-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-10 | 1980-09-09 | 1981-03-11 | $7700.00 | Window Closed / Lapsed |