Patent US3170892A successfully refreshed from Google Patents.
US3170892A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Graft polymers with polysulfone grafts and their preparation
Assignee: EIDP Inc
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Filing: 1960-04-29
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Granted: 1965-02-23
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Expires: 1980-04-29
Abstract
No abstract record available.
Inventors
- 👤 Warren F Busse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:51
CPC Classifications
D; D06; D06M; D06M14/00; D06M14/18; C; C08; C08J; C08J7/00; C08J7/12; C08J7/16; C08J7/18; Y; Y10; Y10S; Y10S8/00; Y10S8/18; Y10T; Y10T428/00; Y10T428/31504; Y10T428/3154; Y10T428/31725; Y10T428/31855; Y10T428/31909; Y10T428/31924
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
THE PROCESS OF FORMING A GRAFT COPOLYMER WHICH COMPRISES CONTACTING A MIXTURE OF AN OLEFIN AND SULFUR DIOXIDE WITH A PREFORMED SOLID SUBSTRATE OF AN ORGANIC POLYMER HAVING A MOLECULAR WEIGHT OF AT LEAST 5000 ACTIVATED BY IRRADIATION WITH AT LEAST 100 RADS OF HIGH ENERGY IONZING RADIATION HAVING A MINIMUM ENERGY OF AT LEAST 100 EV.
Claim 2
Dependent Claim
57 words
THE PROCESS OF FORMING A GRAFT COPOLYMER WHICH COMPRISES CONTACTING A MIXTURE OF AN OLEFIN AND SULFUR DIOXIDE WITH A PREFORMED SOLID SUBSTRATE OF AN ORGANIC POLYMER HAVING A MOLECULAR WEIGHT OF AT LEAST 5000 ACTIVATED BY IRRADIATION WITH AT LEAST 100 RADS OF HIGH ENERGY IONZING RADIATION HAVING A MINIMUM ENERGY OF AT LEAST 100 EV.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-02-23 | 1968-08-24 | 1969-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-02-23 | 1972-08-24 | 1973-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-02-23 | 1976-08-24 | 1977-02-23 | $7700.00 | Window Closed / Lapsed |