US3375231A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolymer of ethyleneimines and lactones and process of preparing same
Assignee: Sumitomo Chemical Co Ltd
•
Filing: 1963-12-23
•
Granted: 1968-03-26
•
Expires: 1983-12-23
Abstract
No abstract record available.
Inventors
- 👤 Fukui Kenichi
- 👤 Yuasa Sachio
- 👤 Kagiya Tsutomu
- 👤 Shimizu Takeo
- 👤 Sano Takezo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:52
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/02; C08G73/0206; C08G73/0213; C08G63/00; C08G63/68; C08G63/685; C08G63/6852
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
16 words
COPOLYMER PRODUCED BY POLYMERIZATION AT A TEMPERATURE OF -20*C. TO 200*C. OF B-LACTONE OF THE FORMULA:
Claim 2
Dependent Claim
16 words
COPOLYMER PRODUCED BY POLYMERIZATION AT A TEMPERATURE OF -20*C. TO 200*C. OF B-LACTONE OF THE FORMULA:
References Cited (Backward Citations)
US2587329A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-03-26 | 1971-09-25 | 1972-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-26 | 1975-09-25 | 1976-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-26 | 1979-09-25 | 1980-03-26 | $7700.00 | Window Closed / Lapsed |