Patent US4557959A successfully refreshed from Google Patents.
US4557959A
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Multilayer medical working means
Assignee: Rehau Plastiks GmbH
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Filing: 1983-02-15
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Granted: 1985-12-10
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Expires: 2003-02-15
Abstract
Abstract A multilayer medical working means comprises at least two walls each made of a glass-clear, soft plastic, with one of the two walls being physiologically unobjectionable and the other wall or walls being a physiologically questionable wall provided with at least one physiologically questionable and/or untested additive. A full-area circumferential connection exists between the physiologically unobjectionable wall and the physiologically questionable wall. A softener gradient is provided between the walls of the working means in such a manner that the physiologically unobjectionable wall has a higher softener content than the physiologically questionable wall directly adjacent thereto which contains at least one physiologically questionable and/or untested additive. The position of the additive is kept constant in the adjacent physiologically questionable wall against the gradient pressure of the softener.
Inventors
- 👤 Georg Kuehlein
- 👤 Ernst Gerlach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:26
CPC Classifications
B; B32; B32B; B32B1/00; B32B1/08; A; A61; A61L; A61L29/00; A61L29/04; A61L29/041; A61L31/00; A61L31/04; A61L31/048; A61L31/08; A61L31/10; A61J; A61J1/00; A61J1/05; A61J1/10; A61M; A61M25/00; A61M25/0009; A61M25/0043; A61M25/0045; B32B2307/00; B32B2307/50; B32B2307/56; B32B2535/00; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1379; Y10T428/139; Y10T428/1393; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192; Y10T428/31928; Y10T428/31935
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
160 words
Multilayer medical working means for containing or transporting a physiological material, said medical working means comprising at least two walls laminated together, wherein; (a) each said wall is made of a glass-clear, soft plastic; (b) one of said two walls is physiologically unobjectionable and the other said wall is a physiologically questionable wall provided with at least one of a physiologically questionable and untested additive, wherein said physiologically unobjectionable wall is arranged to be directly adjacent a physiological material contained or transported by said medical working means; (c) said two walls are adjacent one another and are connected together by a full-area circumferential connection; and (d) said physiologically unobjectionable wall has a higher content of resin softening material than said physiologically questionable wall, causing a softener gradient to be present between said two walls, the position of said additive in said physiologically questionable wall being kept constant in the said physiologically questionable wall against the pressure of the softener gradient.
Claim 2
Dependent Claim
160 words
Multilayer medical working means for containing or transporting a physiological material, said medical working means comprising at least two walls laminated together, wherein; (a) each said wall is made of a glass-clear, soft plastic; (b) one of said two walls is physiologically unobjectionable and the other said wall is a physiologically questionable wall provided with at least one of a physiologically questionable and untested additive, wherein said physiologically unobjectionable wall is arranged to be directly adjacent a physiological material contained or transported by said medical working means; (c) said two walls are adjacent one another and are connected together by a full-area circumferential connection; and (d) said physiologically unobjectionable wall has a higher content of resin softening material than said physiologically questionable wall, causing a softener gradient to be present between said two walls, the position of said additive in said physiologically questionable wall being kept constant in the said physiologically questionable wall against the pressure of the softener gradient.
Claim 3
Dependent Claim
52 words
Medical working means as defined in claim 1, wherein a soft set polyvinyl chloride is used for the physiologically unobjectionable wall and for the physiologically questionable wall, and the softener gradient between the physiologically unobjectionable wall and the physiologically questionable wall has a ratio of 1.1 to 1 to 9 to 1.
Claim 4
Dependent Claim
46 words
Medical working means as defined in claim 1, wherein the physiologically unobjectionable wall is comprised of soft set polyvinyl chloride and the physiologically questionable wall is comprised of another soft polymer, and the softener proportion in the polyvinyl chloride is at least 7 percent by weight.
Claim 5
Dependent Claim
16 words
Medical working means as defined in claim 1, wherein the additive is a radiation absorbing substance.
Claim 6
Dependent Claim
20 words
Medical working means as defined in claim 4, wherein the additive absorbs radiation in the wavelength range of visible light.
Claim 7
Dependent Claim
20 words
Medical working means as defined in claim 4, wherein the additive absorbs radiation in the wavelength range of invisible light.
Claim 8
Dependent Claim
20 words
Medical working means as defined in claim 4, wherein the additive absorbs radiation in the wavelength range of X-ray radiation.
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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) | 1988-12-09 | 1989-06-10 | 1989-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-09 | 1993-06-10 | 1993-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-09 | 1997-06-10 | 1997-12-10 | $7700.00 | Window Closed / Lapsed |