US4788089A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat-recoverable article
Assignee: Raychem Ltd
•
Filing: 1986-03-05
•
Granted: 1988-11-29
•
Expires: 2006-03-05
Abstract
Abstract Self-supporting helical heat-recoverable material provides easily installed insulating covering for wires and cables. The helical arrangement may be made by differential recovery of a two-layered tape of the heat-recoverable material around a cooled mandrel such that the inner tape layer recovers more than the outer. The inner layer may also serve as an adhesive layer or may carry an adhesive coating.
Inventors
- 👤 Richard S. Skipper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:50
CPC Classifications
B; B29; B29C; B29C53/00; B29C53/02; B29C53/12; B29C61/00; B29C61/06; Y; Y10; Y10S; Y10S174/00; Y10S174/08; Y10T; Y10T428/00; Y10T428/13; Y10T428/1328; Y10T428/1331; Y10T428/249921; Y10T428/249922
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
53 words
An article comprising a strip of heat-recoverable polymeric material pre-formed into a self-supporting, self-locating helical configuration capable of being wrapped around a substrate, wherein the strip is pre-formed into a helical configuration having overlapping windings, each having a stepped formation such that each successive winding fits into the step of the previous winding.
Claim 2
Dependent Claim
53 words
An article comprising a strip of heat-recoverable polymeric material pre-formed into a self-supporting, self-locating helical configuration capable of being wrapped around a substrate, wherein the strip is pre-formed into a helical configuration having overlapping windings, each having a stepped formation such that each successive winding fits into the step of the previous winding.
Claim 3
Dependent Claim
20 words
An article according to claim 1, wherein the strip is heat-curlable such that it curls inwardly about the helical axis.
Claim 4
Dependent Claim
16 words
An article according to claim 1 which comprises at least an inner and an outer layer.
Claim 5
Dependent Claim
14 words
An article according to claim 3, wherein the inner and outer layers are cross-linked.
Claim 6
Dependent Claim
14 words
An article according claim 3 wherein at least one of the layers is heat-recoverable.
Claim 7
Dependent Claim
15 words
An article according to claim 3 wherein the inner layer is also an adhesive layer.
Claim 8
Dependent Claim
28 words
An article according to claim 6 wherein the inner layer has been subjected to an electron beam dose of less than 12 Mrads, preferably 2 to 6 Mrads.
Claim 9
Dependent Claim
17 words
An article as claimed in claim 1 which has been wrapped around and recovered onto a substrate.
Claim 10
Dependent Claim
30 words
An article according to claim 1 when held in the form of a substantially flat coil against its own internal forces urging the coil to extend towards the helical configuration.
References Cited (Backward Citations)
US3491799A
Cited
US3379218A
Cited
GB1155470A
Cited
GB1211988A
Cited
GB1346479A
Cited
GB1392212A
Cited
GB1532905A
Cited
US4234758A
Cited
US4239064A
Cited
US4428790A
Cited
US4450871A
Cited
US4523970A
Cited
US4486484A
Cited
US4441017A
Cited
US4497760A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-11-29 | 1992-05-30 | 1992-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-29 | 1996-05-30 | 1996-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-29 | 2000-05-30 | 2000-11-29 | $7700.00 | Window Closed / Lapsed |