US4146668A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyimide molded tool for gripping hot glassware
Assignee: OI Glass Ltd
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Filing: 1976-11-29
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Granted: 1979-03-27
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Expires: 1996-11-29
Abstract
Abstract A moulding material is described, comprising a polyimide resin and a carbon filler, e.g. carbon fibres and/or graphite. The material is for manufacturing shaped articles for handling hot ware, e.g. hot glassware.
Inventors
- 👤 Roger J. Dorey
- 👤 Gabriel Gavrielides
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:47
CPC Classifications
B; B32; B32B; B32B9/00; B32B9/005; B32B9/007; C; C08; C08K; C08K3/00; C08K3/02; C08K3/04; B32B27/00; B32B27/28; B32B27/281; B32B9/04; B32B9/045; B32B2305/00; B32B2305/07; B32B2305/076; B32B2305/08; B32B2379/00; B32B2379/08; Y; Y10; Y10S; Y10S264/00; Y10S264/57; Y10S264/61; Y10T; Y10T428/00; Y10T428/25; Y10T428/29; Y10T428/2913; Y10T428/2918; Y10T428/292; Y10T428/2933; Y10T428/2938; Y10T428/2964; Y10T428/2967; Y10T428/2969; Y10T428/2971; Y10T428/2982; Y10T428/2991; Y10T428/2998; Y10T428/30; Y10T428/31504; Y10T428/31652; Y10T428/31667; Y10T428/31721
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
49 words
A tool for gripping hot articles wherein the article contacting surface is provided by a product formed by moulding a composition consisting essentially of a polyimide resin, graphite powder and carbon fibres, the fibres being aligned in a plane substantially normal to the plane of the article contacting surface.
Claim 2
Dependent Claim
49 words
A tool for gripping hot articles wherein the article contacting surface is provided by a product formed by moulding a composition consisting essentially of a polyimide resin, graphite powder and carbon fibres, the fibres being aligned in a plane substantially normal to the plane of the article contacting surface.
Claim 3
Dependent Claim
34 words
A tool as claimed in claim 1 wherein the polyimide resin is present in an amount of 30 to 70% by weight, based on the total weight of the composition in said shaped product.
Claim 4
Dependent Claim
20 words
A tool as claimed in claim 2 wherein the polyimide resin is present in an amount of 45-60% by weight.
Claim 5
Dependent Claim
24 words
A tool as claimed in claim 2 wherein said shaped product consists of, by weight, 45% polyimide resin, 30% graphite and 25% carbon fibre.
Claim 6
Dependent Claim
24 words
A tool as claimed in claim 2 wherein said shaped product consists of, by weight, 55% polyimide resin, 35% graphite and 10% carbon fibre.
Claim 7
Dependent Claim
21 words
A tool according to claim 1 prepared by a process including the step of post-curing the resin after moulding the composition.
Claim 8
Dependent Claim
81 words
A tool according to claim 1 wherein the article - contacting surface is provided by a carbon-reinforced polyimide resin layer of a laminate prepared by (a) impregnating a carbon fibre substrate with a solution of a polyimide resin containing graphite powder to form a first pre-preg, (b) impregnating a glass fibre substrate with a solution of a polyimide resin to form a second pre-preg, (c) superposing the first and second pre-pregs and (d) subjecting the superposed pre-pregs to heat and pressure.
Claim 9
Dependent Claim
87 words
A tool for contacting hot articles which is made by either (a) compression moulding a composition consisting essentially of carbon fibres, graphite powder and a polyimide resin into a shaped form or (b) compression moulding a material consisting essentially of a carbon fibre mat impregnated with a polyimide resin and graphite powder into a shaped form; cutting the shaped form from (a) or (b) into strips and turning the strips through 90° so that the faces formed by the cutting provide the article-contacting surface of the tool.
Claim 10
Dependent Claim
87 words
A tool for contacting hot articles which is made by either (a) compression moulding a composition consisting essentially of carbon fibres, graphite powder and a polyimide resin into a shaped form or (b) compression moulding a material consisting essentially of a carbon fibre mat impregnated with a polyimide resin and graphite powder into a shaped form; cutting the shaped form from (a) or (b) into strips and turning the strips through 90° so that the faces formed by the cutting provide the article-contacting surface of the tool.
Claim 11
Dependent Claim
58 words
A tool according to claim 8 which is made by compression moulding a composition consisting essentially of carbon fibres, graphite powder and a polyimide resin into a shaped form, cutting the shaped form into strips and turning the strips through 90° so that the faces formed by the cutting provide the article - contacting surface of the tool.
Claim 12
Dependent Claim
57 words
A tool according to claim 8 which is made by compression moulding a carbon fibre mat impregnated with a polyimide resin and graphite powder into a shaped form, cutting the shaped form into strips and turning the strips through 90° so that the faces formed by the cutting provide the article - contacting surface of the tool.
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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) | 1982-03-26 | 1982-09-25 | 1983-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-26 | 1986-09-25 | 1987-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-26 | 1990-09-25 | 1991-03-27 | $7700.00 | Window Closed / Lapsed |