Patent US4337768A successfully refreshed from Google Patents.
US4337768A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyvinyl chloride sheet and method of making the same
Assignee: Toray Industries Inc
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Filing: 1980-07-07
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Granted: 1982-07-06
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Expires: 2000-07-07
Abstract
Abstract This invention relates to a polyvinyl chloride sheet comprising crosslinked thin layer(s) and uncrosslinked layer(s), at least one surface of the sheet being a crosslinked layer. The thickness of the said crosslinked layer ranges between about 0.05 to about 2 microns, and the degree of the chlorination of the said layer is not greater than about 45% of that of the uncrosslinked layer, and the degree of heat shrinkage is not greater than about 1%. This sheet provides many advantages for blood bags and infusion bags.
Inventors
- 👤 Kenji Hatada
- 👤 Hiroaki Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:05
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/24; C08J3/245; A; A61; A61L; A61L33/00; A61L33/06; A61L33/064; B; B29; B29C; B29C59/00; B29C59/14; C08J7/00; C08J7/12; C08J7/123; A61J; A61J1/00; A61J1/14; A61J1/1468; B29K; B29K2027/00; B29K2027/06; B29K2105/00; B29K2105/24; C08J2327/00; C08J2327/02; C08J2327/04; C08J2327/06; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1334; Y10T428/1341; Y10T428/26; Y10T428/269; Y10T428/31; Y10T428/31504; Y10T428/3154
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
65 words
A polyvinyl chloride sheet comprising an uncrosslinked portion having on a surface thereof a crosslinked layer having a thickness of about 0.05 to about 2 microns, said crosslinked layer having a degree of chlorination of about 45% or less as compared to the degree of chlorination of the uncrosslinked portion of the sheet, and said sheet having a heat shrinkage of about 1% or less.
Claim 2
Dependent Claim
65 words
A polyvinyl chloride sheet comprising an uncrosslinked portion having on a surface thereof a crosslinked layer having a thickness of about 0.05 to about 2 microns, said crosslinked layer having a degree of chlorination of about 45% or less as compared to the degree of chlorination of the uncrosslinked portion of the sheet, and said sheet having a heat shrinkage of about 1% or less.
Claim 3
Dependent Claim
14 words
The polyvinyl chloride sheet of claim 1, wherein said crosslinked layer is partially fluorinated.
Claim 4
Dependent Claim
29 words
The polyvinyl chloride sheet of claim 2, wherein the number of fluorine atoms is 10% or more as compared to the number of carbon atoms on the crosslinked surface.
Claim 5
Dependent Claim
12 words
An infusion bag made of a polyvinyl chloride sheet of claim 1.
Claim 6
Dependent Claim
13 words
The infusion bag of claim 4, wherein the crosslinked layer is partially fluorinated.
Claim 7
Dependent Claim
29 words
The infusion bag of claim 5, wherein the number of fluorine atoms is about 10% or more as related to the number of carbon atoms on the crosslinked surface.
Claim 8
Dependent Claim
29 words
A blood bag comprising a polyvinyl chloride bag made from the sheet of claim 1, and with anticoagulation agents in said bag containing sodium citrate as a main constituent.
Claim 9
Dependent Claim
13 words
The blood bag of claim 7, wherein the crosslinked layer is partially fluorinated.
Claim 10
Dependent Claim
29 words
The blood bag of claim 8, wherein the number of fluorine atoms is about 10% or more, as related to the number of carbon atoms on the crosslinked surface.
References Cited (Backward Citations)
US3429732A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-07-05 | 1986-01-04 | 1986-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-05 | 1990-01-04 | 1990-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-05 | 1994-01-04 | 1994-07-06 | $7700.00 | Window Closed / Lapsed |