US4048273A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a structural element
Assignee: Individual
•
Filing: 1975-10-17
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Granted: 1977-09-13
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Expires: 1995-10-17
Abstract
Abstract In the production of a structural element such as a door or a panel forming part of the surround of a swimming pool, a rigid framework is placed on an upwardly presented surface of a mould. The mould is then closed and a foamed plastics material is injected into the mould cavity part of the periphery of which is defined by the framework which becomes an integral part of the moulded product.
Inventors
- 👤 Alan Pryce-Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:20
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/14; B29C45/14311; B29C44/00; B29C44/02; B29C44/12; B29C44/1214; E; E04; E04C; E04C2/00; E04C2/30; E04C2/38; E04C2/384; E06; E06B; E06B3/00; E06B3/70; E06B3/7015; E06B3/82; E06B3/822; B29K; B29K2705/00; B29K2705/02; E06B2003/7023; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49888
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
108 words
A method of making a structural element which includes: a. providing a mould element, b. providing a plurality of frame members including spaced parallel limbs the inner faces of which are provided with keying formations, c. assembling the frame members to form a framework in engagement with the mould element so that the framework cooperates with the mould element to define the periphery of a mould cavity, and d. injecting foamed plastics material into said mould cavity so as to form a structural element which comprises foamed plastics material surrounded by the framework and mechanically interlocked with the keying formations on the inner faces of the frame members.
Claim 2
Independent Claim
108 words
A method of making a structural element which includes: a. providing a mould element, b. providing a plurality of frame members including spaced parallel limbs the inner faces of which are provided with keying formations, c. assembling the frame members to form a framework in engagement with the mould element so that the framework cooperates with the mould element to define the periphery of a mould cavity, and d. injecting foamed plastics material into said mould cavity so as to form a structural element which comprises foamed plastics material surrounded by the framework and mechanically interlocked with the keying formations on the inner faces of the frame members.
Claim 3
Dependent Claim
17 words
A method according to claim 1, wherein the framework is disposed between a pair of mould elements.
Claim 4
Dependent Claim
23 words
A method according to claim 1, wherein the framework is formed from extruded aluminum sections and the foamed plastics material is foamed polyurethane.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-12 | 1981-03-14 | 1981-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-12 | 1985-03-14 | 1985-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-12 | 1989-03-14 | 1989-09-13 | $7700.00 | Window Closed / Lapsed |