US3932096A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mold for thermoforming plastic sheet material
Assignee: Individual
•
Filing: 1974-06-10
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Granted: 1976-01-13
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Expires: 1994-06-10
Abstract
Abstract A molding apparatus for thermoforming plastic sheet material having upper and lower matching molding blocks, each molding block having a thin rigid shell. The shell has a die cavity therein with the exposed face of the shell defining the die cavity surface. A porous body of metallic filler material is contained within the central portion of each molding block and is in contact with the inner surface of the rigid shell. Inlet and outlet means are provided for circulating a coolant fluid through the central portion of each molding block.
Inventors
- 👤 Walter Kartman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:31
CPC Classifications
B; B29; B29C; B29C33/00; B29C33/56; B29C33/02; B29C33/04; B29C51/00; B29C51/26; B29C51/30; B29C51/36; B29C51/365; B29C51/08
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
146 words
A mold for thermoforming plastic sheet material, comprising: upper and lower matching molding blocks, said molding blocks each comprising: a shell having an exterior surface and an interior surface defining a closed cavity; a pourous body of filler material contained within said closed cavity of said shell, said filler material being in surface contact with said interior surface of said closed cavity and comprising a plurality of metallic particles, said pourous body 0f metallic filler particles comprising a continuous rigid mass in which said plurality of metallic filler particles are attached to each other at points of surface contact by resinous material; inlet means for introducing coolant fluid from said molding block; a frame work for supporting said molding blocks at a fixed distance from each other; and wherein part of said exterior surfaces of said upper and lower matching molding blocks define a die cavity.
Claim 2
Dependent Claim
146 words
A mold for thermoforming plastic sheet material, comprising: upper and lower matching molding blocks, said molding blocks each comprising: a shell having an exterior surface and an interior surface defining a closed cavity; a pourous body of filler material contained within said closed cavity of said shell, said filler material being in surface contact with said interior surface of said closed cavity and comprising a plurality of metallic particles, said pourous body 0f metallic filler particles comprising a continuous rigid mass in which said plurality of metallic filler particles are attached to each other at points of surface contact by resinous material; inlet means for introducing coolant fluid from said molding block; a frame work for supporting said molding blocks at a fixed distance from each other; and wherein part of said exterior surfaces of said upper and lower matching molding blocks define a die cavity.
Claim 3
Dependent Claim
42 words
A mold according to claim 1 having at least one means for deflecting the flow of the coolant fluid toward the surface of the die cavity, said means being located within the closed cavity of at least one of said molding blocks.
Claim 4
Dependent Claim
17 words
A mold according to claim 2 in which the thin rigid shell is formed of sheet metal.
Claim 5
Dependent Claim
35 words
A mold according to claim 2 in which the thin rigid shell is formed of a metallic material, suitably treated to promote adhesion, and a high temperature epoxy resin with the metallic content being maximized.
Claim 6
Dependent Claim
18 words
A mold according to claim 4 in which the metallic material in said shell consists of metallic flakes.
Claim 7
Dependent Claim
20 words
A mold according to claim 2 in which the porous body of metallic filler material consists of particulate metallic material.
Claim 8
Dependent Claim
18 words
A mold according to claim 6 in which the particulate metallic filler material consists of spherical metallic beads.
Claim 9
Dependent Claim
21 words
In a mold as recited in claim 1 wherein said plurality of metallic filler particles comprise: a plurality of metallic spheres.
Claim 10
Dependent Claim
23 words
In a mold as recited in claim 1 wherein said plurality of metallic filler particles comprise: a plurality of irregularly shaped metallic particles.
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) | 1979-01-12 | 1979-07-14 | 1980-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-12 | 1983-07-14 | 1984-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-12 | 1987-07-14 | 1988-01-13 | $7700.00 | Window Closed / Lapsed |