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Patent US3256166A successfully refreshed from Google Patents.
US3256166A
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Photo-initiated graft polymerization of cellulosic compositions
Assignee: WR Grace and Co
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Filing: 1961-06-27
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Granted: 1966-06-14
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Expires: 1981-06-27
Abstract
No abstract record available.
Inventors
- 👤 Robert H Pfeiffer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 01:00
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/12; C08J7/16; C08J7/18; C08J2301/00; Y; Y10; Y10S; Y10S8/00; Y10S8/10; Y10S8/18; Y10S8/21
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
IN A PROCESS OF GRAFT POLYMERIZATION IN WHICH A PHOTOSENSITIZER-TREATED CELLULOSE SUBSTRATE IS SUBJECTED TO IRRADIATION WITH ULTRA-VIOLET LIGHT WHILE IN CONTACT WITH A VINYL MONOMER, THE SAID PHOTOSENSITIZER-TREATED SUBSTRATE AND THE SAID VINYL MONOMER BEING THE MAJOR REACTANTS IN THE PROCESS, THE STEP OF FIRST IRRADIATING AT LEAST ONE OF THE MAJOR REACTANTS SEPARATELY WITH ULTRAVIOLET LIGHT BEFORE THE SAID REACTANTS ARE BROUGHT INTO CONTACT WITH EACH OTHER, WHEREB Y THE INDUCTION PERIOD OF THE GRAFT POLYMERIZATION PROCESS IS SUBSTANTIALLY SHORTENED.
Claim 2
Dependent Claim
82 words
IN A PROCESS OF GRAFT POLYMERIZATION IN WHICH A PHOTOSENSITIZER-TREATED CELLULOSE SUBSTRATE IS SUBJECTED TO IRRADIATION WITH ULTRA-VIOLET LIGHT WHILE IN CONTACT WITH A VINYL MONOMER, THE SAID PHOTOSENSITIZER-TREATED SUBSTRATE AND THE SAID VINYL MONOMER BEING THE MAJOR REACTANTS IN THE PROCESS, THE STEP OF FIRST IRRADIATING AT LEAST ONE OF THE MAJOR REACTANTS SEPARATELY WITH ULTRAVIOLET LIGHT BEFORE THE SAID REACTANTS ARE BROUGHT INTO CONTACT WITH EACH OTHER, WHEREB Y THE INDUCTION PERIOD OF THE GRAFT POLYMERIZATION PROCESS IS SUBSTANTIALLY SHORTENED.
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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) | 1969-06-13 | 1969-12-13 | 1970-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-13 | 1973-12-13 | 1974-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-13 | 1977-12-13 | 1978-06-14 | $7700.00 | Window Closed / Lapsed |