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US3899807A Expired / Lapsed US ⏱️ 0.0 years remaining

Heat recoverable articles and method of making same

Assignee: Raychem Corp
•
Filing: 1973-04-05
•
Granted: 1975-08-19
•
Expires: 1993-04-05
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Abstract

Abstract This patent describes laminated articles which are heat recoverable in involute fashion to an overlapping, generally cylindrical configuration and which are useful as wrap-around sleeves for wires, cables, cable splices and the like. Also described are laminated articles initially heat recoverable to an elongate S-shaped configuration, which latter can be wrapped about an elongate substrate, the edge portions thereof interlocked, and heat recovered to form a protective closure. The articles of the invention comprise a first lamina existing in latent compression relative to a second, adjacent lamina such that upon the application of heat the second lamina urges recovery of the first lamina in involute fashion. Means are disclosed whereby the exterior faces of the articles of the invention can be rendered adherable one to the other under the conditions of heat recovery, such that upon involute recovery a bonded, integral article is formed. The involutely heat recoverable articles can be formed of, e.g., polymeric or metallic laminae by a wide variety of processes, the particulars of which are set out herein.

Inventors

  • 👤 Richard C Sovish
  • 👤 Michael B Sullivan
  • 👤 Judson D Wetmore

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-23 21:14
CPC Classifications
F; F16; F16L; F16L47/00; F16L47/20; F16L47/22; B; B29; B29C; B29C61/00; B29C61/06; B29C61/0608; B29C61/0616; B32; B32B; B32B27/00; B29C61/10; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1028; Y10T156/1033; Y10T156/1034; Y10T24/00; Y10T24/14; Y10T24/1457; Y10T24/1498; Y10T24/44; Y10T24/44641; Y10T24/47; Y10T24/4755; Y10T428/00; Y10T428/24; Y10T428/2419; Y10T428/24215; Y10T428/24942

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 86 words
A laminar article having two primary faces and comprising first, second and third thermoplastic laminae which have been crosslinked chemically or by irradiation, said second and third laminae being laminated respectively to opposite edge portions of the opposite faces of said first lamina, said first lamina having been rendered heat recoverable by expansion in its crosslinked state whereas relative to said first lamina said second and third laminae lack heat recoverability, said article being heat recoverable to a configuration describing an elongate S in cross section.
Claim 2
Dependent Claim 86 words
A laminar article having two primary faces and comprising first, second and third thermoplastic laminae which have been crosslinked chemically or by irradiation, said second and third laminae being laminated respectively to opposite edge portions of the opposite faces of said first lamina, said first lamina having been rendered heat recoverable by expansion in its crosslinked state whereas relative to said first lamina said second and third laminae lack heat recoverability, said article being heat recoverable to a configuration describing an elongate S in cross section.
Claim 3
Dependent Claim 20 words
An article according to claim 1 which has been heat recovered to a configuration describing an elongate S in cross-section.
Claim 4
Dependent Claim 38 words
An article according to claim 1 in which the edge portions comprising in cross-section the arcuate end-portions of said S are positioned in interlocking relation and further heat recovered in interspiraling fashion to form a separation resistant closure.
Claim 5
Independent Claim 122 words
A method of forming a heat recoverable wrap-around closure having first, second and third laminae of thermoplastic material which has been crosslinked chemically or by irradiation, which method comprises laminating second and third laminae respectively to opposite edge portions of the opposite faces of a first lamina which has been rendered heat recoverable by expansion in its crosslinked state and before or following the step of lamination, crosslinking the second and third laminae, said second and third laminae being non-heat recoverable relative to said first lamina such that the resulting closure is heat recoverable to an elongate S in cross-section and, upon interlocking the arcuate end-portions of said S is further heat recoverable in interspiraling fashion to form a separation resistant closure.
Claim 6
Independent Claim 122 words
A method of forming a heat recoverable wrap-around closure having first, second and third laminae of thermoplastic material which has been crosslinked chemically or by irradiation, which method comprises laminating second and third laminae respectively to opposite edge portions of the opposite faces of a first lamina which has been rendered heat recoverable by expansion in its crosslinked state and before or following the step of lamination, crosslinking the second and third laminae, said second and third laminae being non-heat recoverable relative to said first lamina such that the resulting closure is heat recoverable to an elongate S in cross-section and, upon interlocking the arcuate end-portions of said S is further heat recoverable in interspiraling fashion to form a separation resistant closure.

References Cited (Backward Citations)

US3416991A Cited
US3542077A Cited
US3681189A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1978-08-18 1979-02-17 1979-08-19 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1982-08-18 1983-02-17 1983-08-19 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1986-08-18 1987-02-17 1987-08-19 $7700.00 Window Closed / Lapsed

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