US4427003A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bandages
Assignee: Smith and Nephew PLC
•
Filing: 1982-01-25
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Granted: 1984-01-24
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Expires: 2002-01-25
Abstract
Abstract Water hardenable splinting bandages comprising a flexible fabric carrying an isocyanate terminated prepolymer having a reaction functionality of not less than two and a catalyst which bandage is characterized in that the prepolymer is a water absorbing isocyanate terminated prepolymer and the catalyst is water soluble but insoluble in the prepolymer, compositions therefore and processes of manufacture thereof are described.
Inventors
- 👤 Jack Fennimore
- 👤 William D. Potter
- 👤 Sinan B. Kiamil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:42
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/22; C08G18/225; A; A61; A61L; A61L15/00; A61L15/07; A61L15/12; C08G18/10; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31562; Y10T428/31565; Y10T428/31573; Y10T428/31587; Y10T428/31598; Y10T428/31601; Y10T442/00; Y10T442/20; Y10T442/2484
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
49 words
A water hardenable splinting bandage comprising a flexible fabric carrying a water absorbing isocyanate terminated prepolymer having a reaction functionality of not less than two in admixture with a solid inorganic catalyst that has an alkaline reaction with water, said inorganic catalyst being water-soluble but insoluble in the prepolymer.
Claim 2
Dependent Claim
49 words
A water hardenable splinting bandage comprising a flexible fabric carrying a water absorbing isocyanate terminated prepolymer having a reaction functionality of not less than two in admixture with a solid inorganic catalyst that has an alkaline reaction with water, said inorganic catalyst being water-soluble but insoluble in the prepolymer.
Claim 3
Dependent Claim
22 words
A water hardenable splinting bandage as claimed in claim 1 in which the reaction functionality of the isocyanate terminated prepolymer is two.
Claim 4
Dependent Claim
24 words
A water hardenable splinting bandage as claimed in claim 1 in which the reaction functionality of the isocyanate terminated prepolymer is more than two.
Claim 5
Dependent Claim
18 words
A water hardenable splinting bandage as claimed in claim 2 in which the isocyanate is an aromatic isocyanate.
Claim 6
Dependent Claim
18 words
A water hardenable splinting bandage as claimed in claim 3 in which the isocyanate is an aliphatic isocyanate.
Claim 7
Dependent Claim
21 words
A water hardenable splinting bandage as claimed in claim 1 in which the catalyst comprises an alkali metal carbonate or bicarbonate.
Claim 8
Dependent Claim
17 words
A water hardenable splinting bandage as claimed in claim 1 in which the catalyst is potassium carbonate.
Claim 9
Dependent Claim
32 words
A water hardenable splinting bandage as claimed in claim 1 in which the catalyst is present in the bandage in an amount of from 2% to 20% by weight of the prepolymer.
Claim 10
Dependent Claim
24 words
A water hardenable splinting bandage of claim 1 in which the isocyanate terminated prepolymer is derived from an ethylene oxide adduct and an isocyanate.
Claim 11
Dependent Claim
22 words
A water hardenable splinting bandage as claimed in claim 1 in which the isocyanate terminated prepolymer has hard blocks containing urea groups.
Claim 12
Dependent Claim
44 words
A method of making water hardenable splinting bandages as described in claim 1 which comprises coating or impregnating a flexible fabric carrier with a mixture of said water absorbing isocyanate terminated prepolymer and said solid water soluble catalyst which is insoluble in the prepolymer.
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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) | 1987-01-23 | 1987-07-25 | 1988-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-23 | 1991-07-25 | 1992-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-23 | 1995-07-25 | 1996-01-24 | $7700.00 | Window Closed / Lapsed |