US4810582A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrophilic polyurethane composition
Assignee: Tyndale Plains Hunter Ltd
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Filing: 1988-03-18
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Granted: 1989-03-07
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Expires: 2008-03-18
Abstract
Abstract Water absorptive polyurethane composition, having high mechanical strength, is formed of A. about 25% to about 75% of a hydrophilic polyether polyurethane which is the reaction product of diethylene glycol and a polyoxyethylene glycol having a molecular weight of about 1000 to about 8000 with a polyisocyanate and B. about 75% to about 25% of a hydrophobic polyester polyurethane which is the reaction product of a polyfunctional polyester derived from the condensation of a polyol with a polybasic acid with a polyisocyanate.
Inventors
- 👤 Francis E. Gould
- 👤 Ellen K. Morgan
- 👤 Stephen D. Reduker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:05
CPC Classifications
A; A61; A61L; A61L27/00; A61L27/14; A61L27/26; C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/65; C08G18/66; C08G18/6666; C08G18/667; C08G18/6674; C08L; C08L75/00; C08L75/04; G; G02; G02B; G02B1/00; G02B1/04; G02B1/041; G02B1/043; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
94 words
As an article of manufacture, a shaped, three-dimensional structure formed of a water absorptive polyurethane composition comprising by weight a physical blend of A. about 25% to about 75% of a hydrophilic polyether polyurethane which is the reaction product of diethylene glycol and a polyoxyethylene glycol having a molecular weight of about 2000 to about 800 with a polyisocyanate and B. about 75% to about 25% of a hydrophobic polyester polyurethane which is the reaction product of a polyfunctional polyester derived from the condensation of a polyol with a polybasic acid with a polyisocyanate.
Claim 2
Dependent Claim
94 words
As an article of manufacture, a shaped, three-dimensional structure formed of a water absorptive polyurethane composition comprising by weight a physical blend of A. about 25% to about 75% of a hydrophilic polyether polyurethane which is the reaction product of diethylene glycol and a polyoxyethylene glycol having a molecular weight of about 2000 to about 800 with a polyisocyanate and B. about 75% to about 25% of a hydrophobic polyester polyurethane which is the reaction product of a polyfunctional polyester derived from the condensation of a polyol with a polybasic acid with a polyisocyanate.
Claim 3
Dependent Claim
13 words
The article of manufacture in claim 1 wherein the structure is a film.
Claim 4
Dependent Claim
20 words
The article of manufacture in claim 1 wherein the structure is a burn dressing in the form of a film.
Claim 5
Dependent Claim
13 words
The article of manufacture in claim 1 wherein the structure contains a medicament.
Claim 6
Dependent Claim
13 words
The article of manufacture in claim 4 wherein the medicament is a hormone.
Claim 7
Dependent Claim
13 words
The article of manufacture in claim 4 wherein the medicament is a steroid.
Claim 8
Dependent Claim
18 words
The article of manufacture in claim 1 wherein the structure is in the form of an intrauterine device.
Claim 9
Dependent Claim
15 words
The article of manufacture in claim 7 wherein the intrauterine device contains a contraceptive composition.
Claim 10
Dependent Claim
19 words
The article of manufacture as defined in claim 1 wherein the structure is in the form of a diaphragm.
Claim 11
Dependent Claim
19 words
The article of manufacture as defined in claim 1 wherein the structure is in the form of a cannula.
Claim 12
Dependent Claim
19 words
The article of manufacture as defined in claim 10 wherein the cannula has distributed throughout its mass a medicament.
Claim 13
Dependent Claim
26 words
The article of manufacture as defined in claim 1 wherein the structure is in the form of an oral delivery system containing a pharmacologically active agent.
Claim 14
Dependent Claim
21 words
The article of manufacture as defined in claim 1 wherein the structure is in the form of a moisture-vapor permeable membrane.
Claim 15
Dependent Claim
15 words
The article of manufacture as defined in claim 1 wherein the structure has been molded.
Claim 16
Dependent Claim
16 words
The article of manufacture as defined in claim 1 wherein the structure is a contact lens.
Claim 17
Dependent Claim
16 words
The article of manufacture as defined in claim 1 wherein the structure is a corneal prosthesis.
Claim 18
Dependent Claim
22 words
The article of manufacture as defined in claim 1 wherein the structure is a surgical drape in the form of a film.
Claim 19
Dependent Claim
20 words
The article of manufacture as defined in claim 1 wherein the structure is in the form of a dialysis membrane.
References Cited (Backward Citations)
US3961629A
Cited
US3928255A
Cited
US3793241A
Cited
US3876581A
Cited
US4279795A
Cited
US4576156A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-03-06 | 1992-09-05 | 1993-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-06 | 1996-09-05 | 1997-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-06 | 2000-09-05 | 2001-03-07 | $7700.00 | Window Closed / Lapsed |