US4502479A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water-activated casting material
Assignee: 3M Co
•
Filing: 1979-09-04
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Granted: 1985-03-05
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Expires: 1999-09-04
Abstract
Abstract An orthopedic casting material is disclosed having improved strength and porosity characteristics. The casting material comprises a fabric which is made from a high modulus fiber and has a thickness between 0.020 and 0.045 inches and a mesh size of 20 to 200 openings per square inch. The fabric is impregnated with a reactive resin which hardens by wetting with a curing agent.
Inventors
- 👤 Donald C. Garwood
- 👤 Shiraz A. Kathiriya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:04
CPC Classifications
D; D04; D04B; D04B21/00; D04B21/10; D04B21/12; A; A43; A43D; A43D3/00; A43D3/02; A43D3/021; A61; A61L; A61L15/00; A61L15/07; A61L15/12; C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G18/16; C08G18/18; C08G18/1825; D10; D10B; D10B2509/00; D10B2509/02; D10B2509/024
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
67 words
An orthopedic casting material comprising a fabric made from a fiber having an initial modulus of elasticity greater than 8×10 6 pounds per square inch, said fabric having a thickness between 0.020 and 0.045 inch and a mesh size of 20 to 200 openings per square inch and a reactive fluid polyisocyanate prepolymer resin impregnated in said fabric which hardens when said resin is wetted with water.
Claim 2
Dependent Claim
67 words
An orthopedic casting material comprising a fabric made from a fiber having an initial modulus of elasticity greater than 8×10 6 pounds per square inch, said fabric having a thickness between 0.020 and 0.045 inch and a mesh size of 20 to 200 openings per square inch and a reactive fluid polyisocyanate prepolymer resin impregnated in said fabric which hardens when said resin is wetted with water.
Claim 3
Dependent Claim
20 words
The orthopedic casting material according to claim 1 wherein said polyisocyanate prepolymer comprises polypropylene oxide polyol endcapped with diphenylmethane diisocyanate.
Claim 4
Dependent Claim
16 words
The orthopedic casting material according to claim 1 wherein said resin further comprises an anti-foaming agent.
Claim 5
Dependent Claim
15 words
The orthopedic casting material according to claim 3 wherein said anti-foaming agent is a silicone.
Claim 6
Dependent Claim
19 words
The orthopedic casting material according to claim 1 wherein said resin further comprises a catalyst to control hardening time.
Claim 7
Dependent Claim
13 words
The orthopedic casting material according to claim 5 wherein said catalyst is dimethylethanolamine.
Claim 8
Dependent Claim
20 words
The orthopedic casting material according to claim 6 wherein said catalyst is a mixture of dimethylethanolamine and amino bis-(dimethylaminoethyl) ether.
Claim 9
Independent Claim
110 words
A method of forming an orthopedic cast on a body member comprising the steps of: 1. covering said body member with an inner protective sleeve comprising an air permeable fabric; and 2. wrapping said body member with an orthopedic casting material comprising a fabric made from a fiber having an initial modulus of elasticity greater than 8×10 6 pounds per square inch, said fabric having a thickness between 0.020 and 0.045 inch and a mesh size of 20 to 200 openings per square inch and a reactive fluid polyisocyanate prepolymer resin impregnated in said fabric which has been wetted with water to harden said resin after said wrapping is completed.
Claim 10
Independent Claim
110 words
A method of forming an orthopedic cast on a body member comprising the steps of: 1. covering said body member with an inner protective sleeve comprising an air permeable fabric; and 2. wrapping said body member with an orthopedic casting material comprising a fabric made from a fiber having an initial modulus of elasticity greater than 8×10 6 pounds per square inch, said fabric having a thickness between 0.020 and 0.045 inch and a mesh size of 20 to 200 openings per square inch and a reactive fluid polyisocyanate prepolymer resin impregnated in said fabric which has been wetted with water to harden said resin after said wrapping is completed.
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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) | 1988-03-04 | 1988-09-03 | 1989-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-04 | 1992-09-03 | 1993-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-04 | 1996-09-03 | 1997-03-05 | $7700.00 | Window Closed / Lapsed |