Patent US4822666A successfully refreshed from Google Patents.
US4822666A
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US
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Radiation stabilized fabric
Assignee: Kimberly Clark Worldwide Inc
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Filing: 1987-12-02
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Granted: 1989-04-18
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Expires: 2007-12-02
Abstract
Abstract There is disclosed a radiation stabilized fabric of polypropylene polymer or copolymer of polypropylene. Radiation stabilization results from adding by weight 0.5%-1.0% of a long-chain aliphatic ester, particularly hexadecyl 3,5-di-t-butyl-4-hydroxybenzoate.
Inventors
- 👤 Robert L. Hudson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:06
CPC Classifications
D; D04; D04H; D04H3/00; D04H3/005; D04H3/007; D04H1/00; D04H1/40; D04H1/42; D04H1/4282; D04H1/4291; Y; Y10; Y10T; Y10T442/00; Y10T442/20; Y10T442/2861; Y10T442/291
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
22 words
A radiation stabilized fabric comprising a nonwoven web formed of a propylene polymer containing a long-chain aliphatic ester of a 3,5-di-t-butyl-4-hydroxybenzoic acid.
Claim 2
Dependent Claim
22 words
A radiation stabilized fabric comprising a nonwoven web formed of a propylene polymer containing a long-chain aliphatic ester of a 3,5-di-t-butyl-4-hydroxybenzoic acid.
Claim 3
Dependent Claim
13 words
The fabric of claim 1, wherein the long-chain aliphatic ester is hexadecyl 3,5-di-t-butyl-4-hydroxybenzoate.
Claim 4
Dependent Claim
11 words
The fabric of claim 1 wherein the propylene polymer is polypropylene.
Claim 5
Dependent Claim
13 words
The fabric of claim 1 wherein the propylene polymer is a propylene-ethylene copolymer.
Claim 6
Dependent Claim
30 words
The fabric of claim 1, 2, 3, or 4, wherein the long-chain aliphatic benzoate ester is present in the web in an amount of 0.5%-1.0% by weight of the web
References Cited (Backward Citations)
US4041203A
Cited
US4115605A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-04-17 | 1992-10-17 | 1993-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-17 | 1996-10-17 | 1997-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-17 | 2000-10-17 | 2001-04-18 | $7700.00 | Window Closed / Lapsed |