US3656476A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymeric structures
Assignee: Polysar Ltd
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Filing: 1970-02-03
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Granted: 1972-04-18
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Expires: 1990-02-03
Abstract
Abstract Orthopedic structures are prepared by forming an envelope of a defined material in a flexible form around a body member, heatsoftening and uniting the adjoining portions of the envelope, and allowing the envelope to harden at reduced temperature. The defined material is a composition based on a crystalline high molecular weight polymer of a conjugated diolefinic compound; preferably the crystalline polymer is trans-1,4 polyisoprene.
Inventors
- 👤 Frederick Bernard Swinney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:01
CPC Classifications
C; C08; C08L; C08L9/00; A; A61; A61F; A61F13/00; A61F13/04; A61L; A61L15/00; A61L15/07; A61L15/12; A61B; A61B17/00; A61B2017/00831; A61B2017/00902; B; B29; B29K; B29K2023/00; B29K2023/04; B29K2023/06; B29K2023/0658; B29K2023/0683
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
22 words
shaping said flexible envelope onto said member whereby the inner form of the envelope corresponds to the form of said body member,
Claim 2
Dependent Claim
20 words
The method according to claim 1 wherein the thermoplastic sheet material has a thickness of about 0.5 to 2.0 millimeter.
Claim 3
Dependent Claim
36 words
The method according to claim 2 wherein the body member is enveloped by more than one layer of said sheet material forming multiple overlapping portions and said overlapping portions are united to form said bonded envelope.
Claim 4
Dependent Claim
21 words
heating the adjoining sides of said envelope at a temperature between about 50* and about 80* C. to make them tacky,
Claim 5
Dependent Claim
9 words
uniting said sides to form a bonded envelope and
Claim 6
Dependent Claim
26 words
The method according to claim 1 wherein the bonded envelope in said step (5) is immersed in water at a temperature of 0* to 15* C.
Claim 7
Dependent Claim
124 words
A rigid orthopaedic or prosthetic structure made of a thermoplastic sheet material having a thickness of not more than about 6 millimeters and comprising a mixture of a synthetic polymer of isoprene having at least 85 percent of the isoprene monomer units in the trans-1,4 configuration, and 5 to about 50 parts by weight per 100 parts polymer of a filler, said polymer being about 20-40 percent crystalline as determined by X-ray diffraction at a temperature from 20* to 30* C. and having a Mooney viscosity (ML-1+4'' at 100* C.) of from 5 to 50, said structure being formable and reformable at a temperature of not over 64* C. to the shape of body member to be protected or fitted on with said structure.
Claim 8
Dependent Claim
33 words
exposing the bonded envelope to an ambient temperature of not more than 30* C. for a period between 1 minute and about 2 hours whereby the envelope hardens to form said orthopedic structure.
Claim 9
Dependent Claim
17 words
The structure of claim 6 in which the sheet material is in the form of a tubing.
Claim 10
Dependent Claim
18 words
The structure of claim 5 in which the sheet material is in the form of a bonded envelope.
Claim 11
Dependent Claim
39 words
The structure of claim 5 in which the sheet material essentially consists of 100 parts by weight of said polymer of isoprene, about 10 parts by weight of hydrated silica and about 5 parts by weight of titanium dioxide.
References Cited (Backward Citations)
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US2853067A
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US3326824A
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US3347839A
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US3286693A
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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) | 1975-04-18 | 1975-10-18 | 1976-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-18 | 1979-10-18 | 1980-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-18 | 1983-10-18 | 1984-04-18 | $7700.00 | Window Closed / Lapsed |