Patent US1995651A successfully refreshed from Google Patents.
US1995651A
Expired / Lapsed
US
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High temperature filtering
Assignee: American Smelting and Refining Co
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Filing: 1932-07-29
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Granted: 1935-03-26
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Expires: 1952-07-29
Abstract
No abstract record available.
Inventors
- 👤 Rathbun Ross Buxton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:51
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/02; B01D46/04; B01D46/66; B01D46/68; B01D46/682; B01D50/00; B01D50/20; B01D2273/00; B01D2273/20; B01D2273/28; Y; Y10; Y10S; Y10S55/00; Y10S55/45
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) | 1938-03-25 | 1938-09-24 | 1939-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-03-25 | 1942-09-24 | 1943-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-03-25 | 1946-09-24 | 1947-03-26 | $7700.00 | Window Closed / Lapsed |