US4422890A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of dimensionally recoverable articles
Assignee: Raychem Ltd
•
Filing: 1981-04-28
•
Granted: 1983-12-27
•
Expires: 2001-04-28
Abstract
Abstract A process for the manufacture of a dimensionally recoverable article comprises forming a plurality of separate component parts thereof, joining the component parts together to form the article, cross-linking the polymeric material from which the parts are formed after they have been joined together, and then expanding the article. The process enables dimensionally recoverable articles of complex shape to be manufactured by high speed moulding processes or extrusion processes without the need for curing of the article during formation thereof.
Inventors
- 👤 Richard J. Penneck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:59
CPC Classifications
B; B29; B29C; B29C65/00; B29C65/02; B29C61/00; B29C61/06; B29C61/0608; B29C61/10; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/114; B29C66/13; B29C66/131; B29C66/50; B29C66/51; B29C66/52; B29C66/522; B29C66/5223; B29C66/52231; B29C66/5224; B29C66/5225; B29C66/53; B29C66/534; B29C66/5344; B29C66/70; B29C66/73; B29C66/737; B29C66/7375; B29C66/73751; B29C66/73752; B29C66/7377; B29C66/73771; B29C66/73772; B29C66/73775; B29C66/73776; B29C66/90; B29C66/91; B29C66/914; B29C66/9141; B29C66/91411; B29C66/919; B29C66/9192; B29C66/91921; H; H02; H02G; H02G15/00; H02G15/08; H02G15/18; H02G15/1806; B29C65/06; B29C65/0672; B29C65/08; B29C65/18; B29C65/20; B29C66/739; B29C66/7392; B29C66/73921; B29C66/80; B29C66/83; B29C66/832; B29C66/8322; B29C66/91931; B29C66/91933; B29L; B29L2031/00; B29L2031/60; B29L2031/601; Y; Y10; Y10S; Y10S174/00; Y10S174/08
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
118 words
A process for the manufacture of an article that is dimensionally-heat-recoverable, which comprises the steps of forming a plurality of shaped component parts of the article from a polymeric material, assembling the component parts to form a hollow article, said article having at least one outlet and having internal lateral dimensions that are greater than the lateral dimensions of the or any outlets, bonding the component parts together, cross-linking the polymeric material after the component parts have been bonded together and then applying heat to expand at least a portion of the article to bring that portion of the article to a temperature above its crystalline melting point, or, for amorphous materials, the softening point of the polymer.
Claim 2
Dependent Claim
118 words
A process for the manufacture of an article that is dimensionally-heat-recoverable, which comprises the steps of forming a plurality of shaped component parts of the article from a polymeric material, assembling the component parts to form a hollow article, said article having at least one outlet and having internal lateral dimensions that are greater than the lateral dimensions of the or any outlets, bonding the component parts together, cross-linking the polymeric material after the component parts have been bonded together and then applying heat to expand at least a portion of the article to bring that portion of the article to a temperature above its crystalline melting point, or, for amorphous materials, the softening point of the polymer.
Claim 3
Dependent Claim
16 words
A process as claimed in claim 1, wherein the component parts are bonded together by welding.
Claim 4
Dependent Claim
20 words
A process as claimed in claim 2, wherein the component parts are welded by a frictional or thermal welding process.
Claim 5
Dependent Claim
32 words
A process as claimed in claim 3, wherein the parts have a circular cross-section in the region where they are to be welded together, and are welded by a spin welding process.
Claim 6
Dependent Claim
20 words
A process as claimed in claim 1, wherein at least some of the component parts have been formed by extrusion.
Claim 7
Dependent Claim
18 words
A process as claimed in claim 1, wherein at least two component parts are formed from different materials.
Claim 8
Dependent Claim
26 words
A process as claimed in claim 1, wherein a preformed mass of adhesive is positioned within one or more component parts before they are joined together.
Claim 9
Dependent Claim
15 words
A process as claimed in claim 1, wherein the polymeric material is cross-linked by irradiation.
Claim 10
Dependent Claim
16 words
A process as claimed in claim 8, wherein the polymeric material is cross-linked by electron irradiation.
Claim 11
Dependent Claim
18 words
A process as claimed in any one of claims 1 to 9, wherein the article is dimensionally heat-recoverable.
References Cited (Backward Citations)
GB659650A
Cited
GB1159675A
Cited
GB1151788A
Cited
DE1941166A1
Cited
US3662094A
Cited
US3770556A
Cited
GB1308358A
Cited
GB1351760A
Cited
US3899807A
Cited
GB1454838A
Cited
US3959052A
Cited
US4298415A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-12-26 | 1987-06-27 | 1987-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-26 | 1991-06-27 | 1991-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-26 | 1995-06-27 | 1995-12-27 | $7700.00 | Window Closed / Lapsed |