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US1941702A
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Method of reducing sulphur compounds to elementary sulphur or hydrogen sulphide
Assignee: HENRY A DOERNER
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Filing: 1931-02-07
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Granted: 1934-01-02
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Expires: 1951-02-07
Abstract
No abstract record available.
Inventors
- 👤 Charles G Maier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:36
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/16; C01B17/164; C01B17/02; C01B17/04; C01B17/0473; C01B17/0491
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) | 1937-01-01 | 1937-07-03 | 1938-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-01-01 | 1941-07-03 | 1942-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-01-01 | 1945-07-03 | 1946-01-02 | $7700.00 | Window Closed / Lapsed |