Patent US1992685A successfully refreshed from Google Patents.
US1992685A
Expired / Lapsed
US
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Production of ferric oxide by burning ferric chloride
Assignee: SULPHUR AND SMELTING Corp
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Filing: 1928-06-22
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Granted: 1935-02-26
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Expires: 1948-06-22
Abstract
No abstract record available.
Inventors
- 👤 Ernest W Wescott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:44
CPC Classifications
C; C01; C01G; C01G49/00; C01G49/02; C01G49/06; Y; Y02; Y02P; Y02P20/00; Y02P20/10; Y02P20/129
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) | 1938-02-25 | 1938-08-27 | 1939-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-02-25 | 1942-08-27 | 1943-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-02-25 | 1946-08-27 | 1947-02-26 | $7700.00 | Window Closed / Lapsed |