US4778656A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for enhancing ionizing radiation
Assignee: General Electric Co
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Filing: 1986-11-24
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Granted: 1988-10-18
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Expires: 2006-11-24
Abstract
Abstract The tendency of polymers which are normally transparent after molding to undergo yellowing upon exposure to ionizing radiation is reduced by blending them with another polymer that has the effect of improving the ionizing radiation resistance over and above a mere dilution effect. The blends are moldable into medical products that can be sterilized repeatedly with little or no yellowing.
Inventors
- 👤 Richard B. Allen
- 👤 Roger W. Avakian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:03
CPC Classifications
C; C08; C08L; C08L67/00; C08L67/02; A; A61; A61L; A61L29/00; A61L29/04; A61L29/049; C08L69/00; C08L69/005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
31 words
In a method for sterilizing a transparent plastic article by ionizing radiation, the improvement which comprises utilizing as the transparent plastic article, an article which is made from a polymer composition.
Claim 2
Dependent Claim
31 words
In a method for sterilizing a transparent plastic article by ionizing radiation, the improvement which comprises utilizing as the transparent plastic article, an article which is made from a polymer composition.
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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) | 1991-10-18 | 1992-04-18 | 1992-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-18 | 1996-04-18 | 1996-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-18 | 2000-04-18 | 2000-10-18 | $7700.00 | Window Closed / Lapsed |