US1988032A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of acetylene
Assignee: IG Farbenindustrie AG
•
Filing: 1932-07-23
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Granted: 1935-01-15
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Expires: 1952-07-23
Abstract
No abstract record available.
Inventors
- 👤 Baumann Paul
- 👤 Bueckert Hanns
- 👤 Sandhaas Wilhelm
- 👤 Schilling Heinrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:37
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/11
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) | 1938-01-14 | 1938-07-16 | 1939-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-01-14 | 1942-07-16 | 1943-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-01-14 | 1946-07-16 | 1947-01-15 | $7700.00 | Window Closed / Lapsed |