Patent US2304178A successfully refreshed from Google Patents.
US2304178A
Expired / Lapsed
US
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Sulphating process and apparatus therefor
Assignee: Individual
•
Filing: 1939-05-15
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Granted: 1942-12-08
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Expires: 1959-05-15
Abstract
No abstract record available.
Inventors
- 👤 Harmon E Keyes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:23
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/36; C01; C01B; C01B17/00; C01B17/69; C01B17/90; C01B17/901; Y; Y10; Y10S; Y10S423/00; Y10S423/01; Y10S423/02
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) | 1945-12-07 | 1946-06-08 | 1946-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-12-07 | 1950-06-08 | 1950-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-12-07 | 1954-06-08 | 1954-12-08 | $7700.00 | Window Closed / Lapsed |