US4758398A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacture preforms
Assignee: Henkel Loctite Corp
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Filing: 1986-10-07
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Granted: 1988-07-19
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Expires: 2006-10-07
Abstract
Abstract A method of preparing a plurality of thermoset resin preforms by extruding a rod, cooling the rod to retain its dimensional uniformity and to reduce further curing of the resin, forming a plurality of grooves in the rod, and fracturing the rod at the grooves to yield the preforms.
Inventors
- 👤 John J. Sparapany
- 👤 Lewis Erwin
- 👤 Kevin J. Prey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:06
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/88; B29C48/911; B29C48/001; B29C48/0022; B29C48/022; B29C48/03; B29C48/06; B29C48/92; B29C2793/00; B29C2793/0027; B29C2948/00; B29C2948/92; B29C2948/92009; B29C2948/92114; B29C2948/92123; B29C2948/92323; B29C2948/92428; B29C2948/92504; B29C2948/9258; B29C2948/92609; B29C2948/92619; B29C2948/92819; B29C2948/92923; B29C2948/92933; B29K; B29K2101/00; B29K2101/10; B29K2301/00; B29K2301/10; Y; Y10; Y10S; Y10S264/00; Y10S264/59; Y10T; Y10T83/00; Y10T83/02; Y10T83/0304
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
100 words
A method of preparing preforms for later use in a separate, subsequent molding process, said method comprising the steps of preprocessing a thermoset resin by mixing the resin and other constituents without fully curing said resin, extruding a rod of said preprocessed thermoset resin without fully curing said resin, immediately cooling the extruded rod to retain its uniform shape and to reduce further curing of the resin, and transversely cutting or fracturing the cooled rod to yield said preforms, which are not fully cured and which are suitable for being held for later use in a separate, subsequent molding process.
Claim 2
Independent Claim
100 words
A method of preparing preforms for later use in a separate, subsequent molding process, said method comprising the steps of preprocessing a thermoset resin by mixing the resin and other constituents without fully curing said resin, extruding a rod of said preprocessed thermoset resin without fully curing said resin, immediately cooling the extruded rod to retain its uniform shape and to reduce further curing of the resin, and transversely cutting or fracturing the cooled rod to yield said preforms, which are not fully cured and which are suitable for being held for later use in a separate, subsequent molding process.
Claim 3
Dependent Claim
11 words
The method of claim 1 wherein said extruded rod is cylindrical.
Claim 4
Dependent Claim
19 words
The method of claim 1 wherein the diameter of said extruded rod is from about 0.25 to 2 inches.
Claim 5
Dependent Claim
19 words
The method of claim 1 wherein the diameter of said extruded rod is from about 0.5 to 1.25 inches.
Claim 6
Dependent Claim
28 words
The method of claim 1 wherein said extruded rod is given a plurality of equally-spaced grooves and said rod is fractured at said grooves to yield said preforms.
Claim 7
Dependent Claim
23 words
The method of claim 1 wherein said cooling step is achieved by passing said rod through a cooling chamber immediately after said extrusion.
Claim 8
Dependent Claim
31 words
The method of claim 6 wherein the diameter of said cooled extruded rod is kept uniform by pulling the rod at a rate controlled by a measurement of the rod diameter.
Claim 9
Dependent Claim
24 words
The method of claim 6 wherein said rod is cooled in said cooling chamber by exposing the surface of said rod to cold fluid.
Claim 10
Dependent Claim
49 words
The method of claim 1 wherein said thermoset resin is preprocessed in a preprocessing extruder and the output of that extruder is supplied directly to the extruder used to extrude the preforms and wherein the preform extruder has internal cooling for rapidly lowering the temperature of the preprocessed resin.
Claim 11
Dependent Claim
13 words
The method of claim 5 wherein said grooves are embossed in said rod.
Claim 12
Dependent Claim
10 words
The method of claim 5 wherein said grooves are V-shaped.
Claim 13
Dependent Claim
19 words
The method of claim 10 wherein a heated embossing tool is used to emboss said grooves in said rod.
Claim 14
Dependent Claim
17 words
The method of claim 1 wherein said rod is extruded through a die having a low-friction liner.
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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) | 1991-07-19 | 1992-01-18 | 1992-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-19 | 1996-01-18 | 1996-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-19 | 2000-01-18 | 2000-07-19 | $7700.00 | Window Closed / Lapsed |