US3242231A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making graft polymers with polysulfone grafts
Assignee: EIDP Inc
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Filing: 1961-10-11
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Granted: 1966-03-22
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Expires: 1981-10-11
Abstract
No abstract record available.
Inventors
- 👤 Graham Boynton
- 👤 Walter E Mochel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:23
CPC Classifications
C; C08; C08F; C08F291/00; C08F291/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
THE PROCESS OF FORMING A GRAFT COPOLYMER WHICH COMPRISES SEQUENTIALLY (1) ACTIVATING A SUBSTRATE FORMED FROM A NORMALLY SOLID ORGANIC POLYMER HAVING A MOLECULAR WEIGHT OF AT LEAST 5000 BY CONTACTING THE SAME WITH OZONE AT A TEMPERATURE BELOW ABOUT 60*C. AND (2) CONTACTING THE ACTIVATED SUBSTRATE WITH A MIXTURE OF SULFUR DIOXIDE AND AN OLEFIN AT A TEMPERATURE ABOVE ABOUT 60*C.
Claim 2
Dependent Claim
62 words
THE PROCESS OF FORMING A GRAFT COPOLYMER WHICH COMPRISES SEQUENTIALLY (1) ACTIVATING A SUBSTRATE FORMED FROM A NORMALLY SOLID ORGANIC POLYMER HAVING A MOLECULAR WEIGHT OF AT LEAST 5000 BY CONTACTING THE SAME WITH OZONE AT A TEMPERATURE BELOW ABOUT 60*C. AND (2) CONTACTING THE ACTIVATED SUBSTRATE WITH A MIXTURE OF SULFUR DIOXIDE AND AN OLEFIN AT A TEMPERATURE ABOVE ABOUT 60*C.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-03-21 | 1969-09-20 | 1970-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-21 | 1973-09-20 | 1974-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-21 | 1977-09-20 | 1978-03-22 | $7700.00 | Window Closed / Lapsed |