US4473671A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Formable orthopedic casts and splints
Assignee: Johnson and Johnson Professional Inc
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Filing: 1983-09-01
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Granted: 1984-09-25
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Expires: 2003-09-01
Abstract
Abstract A cast material comprising a filled crystalline polyurethane is disclosed. The filler is present in an amount of from 30% to 60% by weight composition. The filler comprises from 20% to 60% by weight of calcium metasilicate fibers and from 40 DEG C. to 85 DEG C. by weight of silica.
Inventors
- 👤 Richard Green
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:27
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/07; A61L15/08; A61L15/12; A61F; A61F13/00; A61F13/04; C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/42; C08G18/4236; C08G18/4238; C08G18/82; C08K; C08K3/00; C08K3/34; C08G2250/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
95 words
A thermoplastic casting material having a softening temperature of from 45° C. to 85° C. and capable of recrystallizing to form a rigid self supporting cast within 10 minutes of being softened comprising from 40% to 70% by weight of a crystalline polyurethane polymer and 30% to 60% of a filler, said filler comprising from 20% to 60% of wollastonite calcium metasilicate fibers having a length-to-diameter ratio of from 3:1 to 20:1 and from 40% to 80% of novacite silica in the form of platy particles having a diameter of from 1 to 10 microns.
Claim 2
Dependent Claim
95 words
A thermoplastic casting material having a softening temperature of from 45° C. to 85° C. and capable of recrystallizing to form a rigid self supporting cast within 10 minutes of being softened comprising from 40% to 70% by weight of a crystalline polyurethane polymer and 30% to 60% of a filler, said filler comprising from 20% to 60% of wollastonite calcium metasilicate fibers having a length-to-diameter ratio of from 3:1 to 20:1 and from 40% to 80% of novacite silica in the form of platy particles having a diameter of from 1 to 10 microns.
Claim 3
Dependent Claim
21 words
The cast material of claim 1 in which the polyurethane resin has a number average molecular weight between 25,000 and 100,000.
Claim 4
Dependent Claim
21 words
The cast material of claim 1 in which the filler contains 0.25% to 1% by weight of isopropyl tri(dioctyl pyrophosphato) titanate.
Claim 5
Dependent Claim
23 words
The cast material of claim 1 in which the total filler is present in an amount of 50% by weight of the composition.
Claim 6
Dependent Claim
27 words
The cast material of claim 1 in which the filler consists of 50% by weight of wollastonite calcium metasilicate fibers and 50% by weight of novacite silica.
Claim 7
Dependent Claim
32 words
The casting material of claim 1 in which the polyurethane resin is the reaction product of polyhexamethylene glycol adipate having an average molecular weight of from 1,000 to 3,000 and methylene bis(4-phenylisocyanate).
Claim 8
Dependent Claim
45 words
The cast material of claim 6 in which the total filler is present in the composition in an amount of 50% by weight of the composition, and the filler comprises 50% by weight of wollastonite calcium metasilicate fibers and 50% by weight of novacite silica.
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) | 1987-09-25 | 1988-03-26 | 1988-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-25 | 1992-03-26 | 1992-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-25 | 1996-03-26 | 1996-09-25 | $7700.00 | Window Closed / Lapsed |