US2172403A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing polymers of isobutylene
Assignee: IG Farbenindustrie AG
•
Filing: 1935-03-29
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Granted: 1939-09-12
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Expires: 1955-03-29
Abstract
No abstract record available.
Inventors
- 👤 Otto Michael
- 👤 Helmuth G Schneider
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:44
CPC Classifications
C; C07; C07C; C07C11/00; C07C11/02; C07C2/00; C07C2/02; C07C2/04; C07C2/06; C07C2/08; C07C2/14; C07C2/16; C07C2/26; C07C2527/00; C07C2527/02; C07C2527/04; C07C2531/00; C07C2531/02
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) | 1942-09-11 | 1943-03-13 | 1943-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-09-11 | 1947-03-13 | 1947-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-09-11 | 1951-03-13 | 1951-09-12 | $7700.00 | Window Closed / Lapsed |