US4749734A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radiation stabilization of polymeric material
Assignee: Becton Dickinson and Co
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Filing: 1985-01-31
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Granted: 1988-06-07
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Expires: 2005-01-31
Abstract
Abstract The present invention relates generally to semi-crystalline polymers which are suitable for stabilization by irradiation sterilization. More particularly, the present invention relates to improved additives for semi-crystalline polymers, such as propylene polymer compositions, to improve the properties of the polymer when subject to irradiation.
Inventors
- 👤 Joel L. Williams
- 👤 Terry S. Dunn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:41
CPC Classifications
A; A61; A61L; A61L2/00; A61L2/02; A61L2/08; C; C08; C08K; C08K5/00; C08K5/0008; C08K5/0016; C08K5/16; C08K5/34; C08K5/3412; C08K5/3432; C08K5/3435
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
38 words
A composition having improved irradiation sterilization stability when subjected to irradiation comprising a semi-crystalline polymer having incorporated therein about 4.7 percent of hydrocarbon oil and about 0.1 percent of a hindered amine of the formula di-2,,2,6,6, tetramethyl-4-piperidyl sebacate.
Claim 2
Dependent Claim
38 words
A composition having improved irradiation sterilization stability when subjected to irradiation comprising a semi-crystalline polymer having incorporated therein about 4.7 percent of hydrocarbon oil and about 0.1 percent of a hindered amine of the formula di-2,,2,6,6, tetramethyl-4-piperidyl sebacate.
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) | 1991-06-07 | 1991-12-07 | 1992-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-07 | 1995-12-07 | 1996-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-07 | 1999-12-07 | 2000-06-07 | $7700.00 | Window Closed / Lapsed |