US3375233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Novel highly polymerized polyamine sulfone and method for producing the same
Assignee: Nitto Boseki Co Ltd
•
Filing: 1965-05-21
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Granted: 1968-03-26
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Expires: 1985-05-21
Abstract
No abstract record available.
Inventors
- 👤 Harada Susumu
- 👤 Katayama Masamichi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:04
CPC Classifications
C; C08; C08G; C08G75/00; C08G75/20; C08G75/205; C08G75/22; Y; Y10; Y10S; Y10S526/00; Y10S526/923
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
41 words
A POLYAMINE SULFONE CONTAINING AT LEAST 1/3 MOL OF SULFONE LINKAGE PER AMINE MONOMER UNIT IN THE MOLECULAR CHAIN PREPARED BY RADICAL COPOLYMERIZATION OF SULFUR DIOXIDE AND AN UNSATURATED AMINE COMPOUND HAVING ONE OF THE FOLLOWING GENERAL FORMULAS I TO IV:
Claim 2
Dependent Claim
41 words
A POLYAMINE SULFONE CONTAINING AT LEAST 1/3 MOL OF SULFONE LINKAGE PER AMINE MONOMER UNIT IN THE MOLECULAR CHAIN PREPARED BY RADICAL COPOLYMERIZATION OF SULFUR DIOXIDE AND AN UNSATURATED AMINE COMPOUND HAVING ONE OF THE FOLLOWING GENERAL FORMULAS I TO IV:
References Cited (Backward Citations)
US2192467A
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 |