Patent US1945592A successfully refreshed from Google Patents.
US1945592A
Expired / Lapsed
US
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Purification of acetylene
Assignee: IG Farbenindustrie AG
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Filing: 1931-11-19
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Granted: 1934-02-06
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Expires: 1951-11-19
Abstract
No abstract record available.
Inventors
- 👤 Bueckert Hanns
- 👤 Tanneberger Helmut
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:01
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/09
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) | 1937-02-05 | 1937-08-07 | 1938-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-02-05 | 1941-08-07 | 1942-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-02-05 | 1945-08-07 | 1946-02-06 | $7700.00 | Window Closed / Lapsed |