Patent US4433680A successfully refreshed from Google Patents.
US4433680A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethane casting material
Assignee: Johnson and Johnson Professional Inc
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Filing: 1982-02-10
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Granted: 1984-02-28
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Expires: 2002-02-10
Abstract
Abstract An improved polyurethane orthopaedic cast bandage is disclosed. The bandage is a polyurethane prepolymer coated on an open-weave, fibrous substrate. The prepolymer contains dimorpholinodiethylether as a catalyst which gives the cast bandage increased shelf stability and excellent set time.
Inventors
- 👤 Hee K. Yoon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:46
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/18; C08G18/20; C08G18/2081; A; A61; A61L; A61L15/00; A61L15/07; A61L15/12; C08G18/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
51 words
A storage-stable orthopaedic cast bandage comprising a water-activatable polyurethane prepolymer coated on an open-weave fibrous substrate, said prepolymer comprising an aromatic polyisocyanate and a polyol in an equivalent ratio of from 2:1 to 15:1 and containing from 0.1% to 10%, based on the weight of prepolymer, of dimorpholinodiethylether as a catalyst.
Claim 2
Dependent Claim
51 words
A storage-stable orthopaedic cast bandage comprising a water-activatable polyurethane prepolymer coated on an open-weave fibrous substrate, said prepolymer comprising an aromatic polyisocyanate and a polyol in an equivalent ratio of from 2:1 to 15:1 and containing from 0.1% to 10%, based on the weight of prepolymer, of dimorpholinodiethylether as a catalyst.
Claim 3
Dependent Claim
18 words
The cast bandage of claim 1 in which the aromatic polyisocyanate is a diphenylmethane diisocyanate containing carbodiimide groups.
Claim 4
Dependent Claim
27 words
The cast bandage of claim 1 in which the polyol is a mixture of poly(oxypropylene) diols and triols having a molecular weight of from 400 to 2,000.
Claim 5
Dependent Claim
15 words
The cast bandage of claim 1 containing from 1% to 4% by weight of dimorpholinodiethylether.
Claim 6
Dependent Claim
29 words
The cast bandage of claim 1 in which the prepolymer contains 0.01% to 1% by weight of benzoyl chloride and 0.01% to 1% by weight of an antifoam agent.
Claim 7
Dependent Claim
21 words
The cast bandage of claim 1 in which the percent NCO in the prepolymer is from 5% to 30% by weight.
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) | 1987-02-27 | 1987-08-29 | 1988-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-27 | 1991-08-29 | 1992-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-27 | 1995-08-29 | 1996-02-28 | $7700.00 | Window Closed / Lapsed |