US4189364A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing hydrophilic polymers and polymer grafts including irradiation
Assignee: Hydroplastics Inc
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Filing: 1974-01-17
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Granted: 1980-02-19
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Expires: 1994-01-17
Abstract
Abstract Hydrophilic polymers are formed in situ by irradiating a mixture of hydroxyalkyl methacrylate and a cross linking agent. The former polymer is optically clear and free of voids, obviating the discoloration and discontinuity deficiencies characterizing prior art polymerization employing foreign substances such as solvents, dispersing agents, catalysts and the like. In accordance with one aspect of the present invention, the hydrophilic polymer may be formed as a coating on a glass, plastic or other substrate.
Inventors
- 👤 Rene Aelion
- 👤 Edward Ferezy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:36
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/12; C08J7/16; C08J7/18; B; B29; B29D; B29D11/00; B29D11/0073; B29D11/00865; C03; C03C; C03C17/00; C03C17/28; C03C17/32; C08F; C08F220/00; C08F220/02; C08F220/10; C08F220/20; G; G02; G02B; G02B1/00; G02B1/04; G02B1/041; G02B1/043
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
78 words
The process for forming hydrophilic polymers comprising the steps of preparing a monomer system comprising hydroxyalkyl methacrylate and a cross linking agent sufficient to polymerize the monomer system upon irradiation, and exposing said monomer system to high energy irradiation of a dose sufficient to polymerize said monomer system, and at a dose rate sufficiently small to not create voids, wherein said irradiation steps comprise the step of sequentially irradiating said monomer system with fields of monotonically increasing strength.
Claim 2
Dependent Claim
78 words
The process for forming hydrophilic polymers comprising the steps of preparing a monomer system comprising hydroxyalkyl methacrylate and a cross linking agent sufficient to polymerize the monomer system upon irradiation, and exposing said monomer system to high energy irradiation of a dose sufficient to polymerize said monomer system, and at a dose rate sufficiently small to not create voids, wherein said irradiation steps comprise the step of sequentially irradiating said monomer system with fields of monotonically increasing strength.
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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) | 1983-02-18 | 1983-08-20 | 1984-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-18 | 1987-08-20 | 1988-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-18 | 1991-08-20 | 1992-02-19 | $7700.00 | Window Closed / Lapsed |