US1990458A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scum removing apparatus for liquids
Assignee: Chain Belt Co
•
Filing: 1931-10-12
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Granted: 1935-02-05
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Expires: 1951-10-12
Abstract
No abstract record available.
Inventors
- 👤 William B Marshall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:12
CPC Classifications
B; B01; B01D; B01D21/00; B01D21/10; B01D21/12; B01D21/24; B01D21/2433
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) | 1938-02-04 | 1938-08-06 | 1939-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-02-04 | 1942-08-06 | 1943-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-02-04 | 1946-08-06 | 1947-02-05 | $7700.00 | Window Closed / Lapsed |