US4947839A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Orthopedic casting material having reduced tack and reduced slip
Assignee: CARAPACE PO BOX 470040 TULSA OK 74147 A CORP OF TX
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Filing: 1988-08-18
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Granted: 1990-08-14
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Expires: 2008-08-18
Abstract
Abstract An orthopedic casting material comprising a fabric impregnated and/or coated with a reactive fluid polyisocyanate prepolymer which hardens when wetted with water is treated with a mixture of oil and polymeric micro-powder to produce a material with reduced tack, reduced slip and reduced foaming properties compared to similar commercially available products. The material is further preferably coated or impregnated with a filler such as amorphous silicate.
Inventors
- 👤 James L. Clark
- 👤 Ali Ozsahin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:56
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/07; A61L15/12; A61L15/125
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
63 words
An orthopedic casting material comprising a fabric coated or impregnated with a combination of a reactive fluid polyisocyanate prepolymer which hardens when said resin is wetted with water and detackifier mixture comprising an oil which is immiscible with said prepolymer and polymeric micro-powder, said polymeric micropowder comprising a fluorocarbon polymer powder having an average particle size of no more than about 1 micron.
Claim 2
Dependent Claim
63 words
An orthopedic casting material comprising a fabric coated or impregnated with a combination of a reactive fluid polyisocyanate prepolymer which hardens when said resin is wetted with water and detackifier mixture comprising an oil which is immiscible with said prepolymer and polymeric micro-powder, said polymeric micropowder comprising a fluorocarbon polymer powder having an average particle size of no more than about 1 micron.
Claim 3
Dependent Claim
13 words
The casting material of claim 1 in which said oil is mineral oil.
Claim 4
Dependent Claim
21 words
The casting material of claim 1 in which said polyisocyanate prepolymer comprises the reaction product of diphenylmethane diisocyanate and polypropylene glycol.
Claim 5
Dependent Claim
13 words
The casting material of claim 3 in which said oil is mineral oil.
Claim 6
Dependent Claim
17 words
The casting material of claim 1 which further comprises a high volume, low density inorganic filler material.
Claim 7
Dependent Claim
52 words
The casting material of claim 5 in which said detackifier mixture comprises about 2-40 wt.% polymeric micropowder, about 60-98 wt.% oil and 0-30 wt.% inorganic filler material, based on total weight of said detackifier mixture, and in which said inorganic filler has an average particle size of about 25 to 30 microns.
Claim 8
Dependent Claim
23 words
The casting material of claim 5 in which said filler material is selected from the group consisting of amorphous silicates and fumed silica.
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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) | 1993-08-13 | 1994-02-12 | 1994-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-13 | 1998-02-12 | 1998-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-13 | 2002-02-12 | 2002-08-14 | $7700.00 | Window Closed / Lapsed |