US4285073A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Keratoprosthetic polyurethane
Assignee: Thermo Fisher Scientific Inc
•
Filing: 1980-02-11
•
Granted: 1981-08-25
•
Expires: 2000-02-11
Abstract
Abstract A reaction product of methylene diisocyanate, polytetramethylene ether glycol and ethylene oxide-capped trimethylol propane. The resulting polyurethane is optically clear and suitable for use as an artificial cornea, or a permanently implantable lens.
Inventors
- 👤 Michael Szycher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:44
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/14; A61F2/142; A61F2/16; A61L; A61L27/00; A61L27/14; A61L27/18; C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/65; C08G18/66; C08G18/6666; C08G18/667; C08G18/6674; C08G18/6677; C08G18/70; C08G18/72; C08G18/74; C08G18/75; C08G18/758
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
55 words
An artificial cornea intended for implantation in a human eyeball, said cornea being characterized in that it is formed from an aliphatic polyurethane elastomer, said polyurethane elastomer being the reaction product of: (1) hydrogenated methylene diisocyanate; (2) polytetramethylene ether glycol having a molecular weight between the range of 500-5000; and (3) ethylene oxide-capped trimethylol propane.
Claim 2
Dependent Claim
55 words
An artificial cornea intended for implantation in a human eyeball, said cornea being characterized in that it is formed from an aliphatic polyurethane elastomer, said polyurethane elastomer being the reaction product of: (1) hydrogenated methylene diisocyanate; (2) polytetramethylene ether glycol having a molecular weight between the range of 500-5000; and (3) ethylene oxide-capped trimethylol propane.
Claim 3
Dependent Claim
27 words
The artificial cornea as set forth in claim 1 wherein the molecular weight of the polytetramethylene ether glycol is between the range of 1000-3000 molecular weight units.
Claim 4
Dependent Claim
55 words
An artificial lens intended for implantation in a human eyeball, said lens being characterized in that it is formed from an aliphatic polyurethane elastomer, said polyurethane elastomer being the reaction product of: (1) hydrogenated methylene diisocyanate; (2) polytetramethylene ether glycol having a molecular weight between the range of 500-5000; and (3) ethylene oxide-capped trimethylol propane.
Claim 5
Dependent Claim
55 words
An artificial lens intended for implantation in a human eyeball, said lens being characterized in that it is formed from an aliphatic polyurethane elastomer, said polyurethane elastomer being the reaction product of: (1) hydrogenated methylene diisocyanate; (2) polytetramethylene ether glycol having a molecular weight between the range of 500-5000; and (3) ethylene oxide-capped trimethylol propane.
Claim 6
Dependent Claim
27 words
The artificial lens as set forth in claim 3 wherein the molecular weight of the polytetramethylene ether glycol is between the range of 1000-3000 molecular weight units.
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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) | 1984-08-24 | 1985-02-23 | 1985-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-24 | 1989-02-23 | 1989-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-24 | 1993-02-23 | 1993-08-25 | $7700.00 | Window Closed / Lapsed |