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US3743455A Expired / Lapsed US ⏱️ 0.0 years remaining

Apparatus for diffusion molding

Assignee: General Dynamics Corp
•
Filing: 1971-09-30
•
Granted: 1973-07-03
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Expires: 1991-09-30
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Abstract

Abstract An apparatus for diffusion molding cubical granules of metal into a workpiece. Tooling is assembled to form the shape of a mold cavity which contains the cubically-shaped metal granules to be diffusion molded. Collapsible supports space the tooling from the interior walls of an envelope containing the tooling. Pressure bars, slidably engaged with the walls of the mold cavity, transmit compressive force applied on the envelope to the metallic granules. The envelope is sealed and evacuated to facilitate oxide and contaminate-free diffusion molding. The method for diffusion molding cubically shaped metal granules into a workpiece comprises cleaning the granules, depositing them into the cavity of a tooling mold, vibrating the tooling mold to orient the interfaces of the cubical granules into alignment with one another, encapsulating the tooling mold in a sealed enclosure, evacuating the enclosure, applying heat and pressure to the enclosure to effect diffusion molding of the granules into a workpiece configuration, and removing the workpiece from the enclosure and reusable tooling mold.

Inventors

  • 👤 E Green

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-28 19:24
CPC Classifications
B; B22; B22F; B22F3/00; B22F7/00; Y; Y10; Y10S; Y10S425/00; Y10S425/812

Claims Analysis

Total Claims: 11
Claim 1
Independent Claim 138 words
A diffusion molding apparatus comprising: an enclosure having a base, cover, and side closures, said cover being spaced from said base by said side closures, said side closures being deformable, said spacing between said cover and base being reduced upon deformation of said side closures, tooling encapsulated within said enclosure, said tooling having internal walls defining the shape of a cavity in which diffusion molding material is contained, collapsible support means spacing said tooling from an adjacent interior surface of said enclosure, a pressure member slidably engaging said internal walls of said tooling, said pressure member projecting into said tooling cavity into contact with said diffusion molding material, said diffusion molding material being compressed into said tooling cavity by said pressure members to mold a workpiece upon deformation of said side closures and collapse of said support means.
Claim 2
Dependent Claim 138 words
A diffusion molding apparatus comprising: an enclosure having a base, cover, and side closures, said cover being spaced from said base by said side closures, said side closures being deformable, said spacing between said cover and base being reduced upon deformation of said side closures, tooling encapsulated within said enclosure, said tooling having internal walls defining the shape of a cavity in which diffusion molding material is contained, collapsible support means spacing said tooling from an adjacent interior surface of said enclosure, a pressure member slidably engaging said internal walls of said tooling, said pressure member projecting into said tooling cavity into contact with said diffusion molding material, said diffusion molding material being compressed into said tooling cavity by said pressure members to mold a workpiece upon deformation of said side closures and collapse of said support means.
Claim 3
Dependent Claim 50 words
The diffusion molding apparatus of claim 1 in which: internal tooling is positioned within said cavity of said tooling, said internal tooling having external walls, said internal walls of said tooling and said external walls of said internal tooling defining the cavity in which said diffusion molding material is contained.
Claim 4
Dependent Claim 21 words
The diffusion molding apparatus of claim 1 in which: at least one of said internal walls of said tooling is movable.
Claim 5
Dependent Claim 21 words
The diffusion molding apparatus of claim 2 in which: said pressure member slidably engages the external walls of said internal tooling.
Claim 6
Dependent Claim 31 words
The diffusion molding apparatus of claim 2 in which: said pressure member slidably engages said external walls of said internal tooling and said external walls of adjacent of said internal tooling.
Claim 7
Dependent Claim 19 words
The diffusion molding apparatus of claim 2 in which: collapsible support means space said internal tooling from said enclosure.
Claim 8
Dependent Claim 22 words
The diffusion molding apparatus of claim 2 in which: at least one of said external walls of said internal tooling is movable.
Claim 9
Dependent Claim 22 words
The diffusion molding apparatus of claim 1 in which: said collapsible support means engages said base of said enclosure and said tooling.
Claim 10
Dependent Claim 18 words
The diffusion molding apparatus of claim 1 in which: said pressure member engages said cover of said enclosure.
Claim 11
Dependent Claim 18 words
The diffusion molding apparatus of claim 1 in which: said pressure member engages said base of said enclosure.

References Cited (Backward Citations)

US1609460A Cited
US2253003A Cited
US2360528A Cited
US2482342A Cited
US2513785A Cited
US3358061A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1976-07-02 1977-01-01 1977-07-03 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1980-07-02 1981-01-01 1981-07-03 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1984-07-02 1985-01-01 1985-07-03 $7700.00 Window Closed / Lapsed

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