Patent US1974952A successfully refreshed from Google Patents.
US1974952A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dust collecting apparatus
Assignee: Individual
•
Filing: 1931-10-05
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Granted: 1934-09-25
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Expires: 1951-10-05
Abstract
No abstract record available.
Inventors
- 👤 Michael A Eiben
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:07
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/02; B01D46/04; B01D46/66; B01D46/70; B01D46/42; B01D46/4272
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1937-09-24 | 1938-03-26 | 1938-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-09-24 | 1942-03-26 | 1942-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-09-24 | 1946-03-26 | 1946-09-25 | $7700.00 | Window Closed / Lapsed |