US4394462A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mixtures of polymers for medical use
Assignee: Hospal Sodip SA
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Filing: 1982-09-13
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Granted: 1983-07-19
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Expires: 2002-09-13
Abstract
Abstract A process for preparing polymers compositions of a mixture of vinyl chloride polymer and polyurethane with tertiary amine and/or ammonium groups.
Inventors
- 👤 Christian Pusineri
- 👤 Jean Goletto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:52
CPC Classifications
C; C08; C08L; C08L27/00; C08L27/02; C08L27/04; C08L27/06; A; A61; A61L; A61L29/00; A61L29/04; A61L29/049; A61L33/00; A61L33/0005; A61L33/0011; A61L33/0023; A61L33/06; A61L33/062; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/0804; C08G18/0809; C08G18/0814; C08L75/00; C08L75/04; C08L75/12; C08L75/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
Process for the preparation of a foamed composition having good compatibility with biological materials consisting of a mixture of vinyl chloride polymer and a polyether-urethane with tertiary amine and/or ammonium groups with the proportion of the polyether-urethane being from 1 to 99 percent by weight, relative to the total mixture, on a blowing agent or a solvent in an inadequate amount to solubilise the total amount of the composition, and in that this paste is then extruded at a temperature below 100° C. to foam said mixture of polymers.
Claim 2
Dependent Claim
89 words
Process for the preparation of a foamed composition having good compatibility with biological materials consisting of a mixture of vinyl chloride polymer and a polyether-urethane with tertiary amine and/or ammonium groups with the proportion of the polyether-urethane being from 1 to 99 percent by weight, relative to the total mixture, on a blowing agent or a solvent in an inadequate amount to solubilise the total amount of the composition, and in that this paste is then extruded at a temperature below 100° C. to foam said mixture of polymers.
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) | 1986-07-18 | 1987-01-17 | 1987-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-18 | 1991-01-17 | 1991-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-18 | 1995-01-17 | 1995-07-19 | $7700.00 | Window Closed / Lapsed |