Patent US1996185A successfully refreshed from Google Patents.
US1996185A
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Process of producing carbides and making acetylene therefrom
Assignee: Wulff Process Co
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Filing: 1929-10-14
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Granted: 1935-04-02
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Expires: 1949-10-14
Abstract
No abstract record available.
Inventors
- 👤 Robert G Wulff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:09
CPC Classifications
C; C01; C01B; C01B32/00; C01B32/90; C01B32/914; C01B32/942
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) | 1938-04-01 | 1938-10-01 | 1939-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-04-01 | 1942-10-01 | 1943-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-04-01 | 1946-10-01 | 1947-04-02 | $7700.00 | Window Closed / Lapsed |