Patent US3650646A successfully refreshed from Google Patents.
US3650646A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for forming powder compacts of uniform interconnected porosity
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1969-08-08
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Granted: 1972-03-21
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Expires: 1989-08-08
Abstract
Abstract Powder compacting apparatus includes an enclosure made of two parts of elastomeric material. One internal part contains the powder and is made of relatively soft, flowable, elastomeric material. The other part is external to the first part and is made of relatively hard, elastomeric material. The enclosure fits in a die cavity, with the hard elastomeric part placed to form a seal between the soft elastomeric part and the interface or open junction between walls of the die cavity. Pressing force applied to the die is transmitted to all sides of the enclosure to exert pressure isostatically on the powder, with the hard elastomeric part pressed against the wall interface of the die cavity to prevent extrusion of the soft elastomeric part from the die cavity.
Inventors
- 👤 Milton E Kirkpatrick
- 👤 Ralph A Mendelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:01
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/004; H01G9/04; H01G9/048; H01G9/052; B; B22; B22F; B22F3/00; B22F3/02; B22F3/04; B22F3/10; B22F3/11; B22F3/1103; B22F3/12; B22F3/1208; B22F3/14; B22F3/15; Y; Y10; Y10S; Y10S425/00; Y10S425/026
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
154 words
In combination: means forming a die cavity and including a base portion, side walls, and a member movable along said side walls and terminating in an internal surface within said cavity that forms a junction with said side walls; and enclosure means within said die cavity and dimensioned to fit within said die cavity; said enclosure means including an all enclosing cavity-forming portion for containing a charge of compactible powder paRticles and formed of relatively soft, elastomeric solid material; said enclosure means also including an external portion of relatively hard, elastomeric solid material arranged between the internal surface of said movable member and said cavityforming portion so as to engage said internal surface and said side walls at the junction thereof; whereby when said movable member is forced against said enclosure means, pressure is exerted isostatically upon said enclosure means and said powder particles, and said external portion forms a seal at said junction.
Claim 2
Dependent Claim
154 words
In combination: means forming a die cavity and including a base portion, side walls, and a member movable along said side walls and terminating in an internal surface within said cavity that forms a junction with said side walls; and enclosure means within said die cavity and dimensioned to fit within said die cavity; said enclosure means including an all enclosing cavity-forming portion for containing a charge of compactible powder paRticles and formed of relatively soft, elastomeric solid material; said enclosure means also including an external portion of relatively hard, elastomeric solid material arranged between the internal surface of said movable member and said cavityforming portion so as to engage said internal surface and said side walls at the junction thereof; whereby when said movable member is forced against said enclosure means, pressure is exerted isostatically upon said enclosure means and said powder particles, and said external portion forms a seal at said junction.
Claim 3
Dependent Claim
122 words
In combination: means forming a die cavity defined by walls of hard, relatively nondeformable material, with a portion of said walls being movable relative to other portions thereof to form a sliding junction; within said die cavity an enclosure means formed of relatively soft, elastomeric, solid material and capable of assembly to form a closed cavity for containing a charge of compactible powder particles; and sealing means formed of relatively hard, elastomeric solid material disposed between and abutting said enclosure means and said relatively movable wall portions, whereby upon relative motion of said cavity wall portions, pressure is exerted isostatically by said cavity walls on said sealing means and enclosure means to seal said junction and to compress said powder particles isostatically.
Claim 4
Dependent Claim
122 words
In combination: means forming a die cavity defined by walls of hard, relatively nondeformable material, with a portion of said walls being movable relative to other portions thereof to form a sliding junction; within said die cavity an enclosure means formed of relatively soft, elastomeric, solid material and capable of assembly to form a closed cavity for containing a charge of compactible powder particles; and sealing means formed of relatively hard, elastomeric solid material disposed between and abutting said enclosure means and said relatively movable wall portions, whereby upon relative motion of said cavity wall portions, pressure is exerted isostatically by said cavity walls on said sealing means and enclosure means to seal said junction and to compress said powder particles isostatically.
Claim 5
Dependent Claim
137 words
In combination: means forming a die cavity bounded by walls of hard, relatively nondeformable material, one of said walls being movable within said cavity relative to an adjacent wall and forming a junction therewith; within said die cavity an enclosure means formed of elastomeric material and capable of assembly to form a closed cavity for containing a charge of compactible powder particles; said enclosure means including an internal portion of relatively soft, solid material for containing said powder particles, and an external portion of relatively hard, solid material; and said cavity walls and said enclosure means being so dimensioned and arranged that when force is exerted on said movable wall, said walls engage and exert pressure isostatically on said enclosure means and said powder particles while said external portion seals said wall junction from said internal portion.
Claim 6
Dependent Claim
137 words
In combination: means forming a die cavity bounded by walls of hard, relatively nondeformable material, one of said walls being movable within said cavity relative to an adjacent wall and forming a junction therewith; within said die cavity an enclosure means formed of elastomeric material and capable of assembly to form a closed cavity for containing a charge of compactible powder particles; said enclosure means including an internal portion of relatively soft, solid material for containing said powder particles, and an external portion of relatively hard, solid material; and said cavity walls and said enclosure means being so dimensioned and arranged that when force is exerted on said movable wall, said walls engage and exert pressure isostatically on said enclosure means and said powder particles while said external portion seals said wall junction from said internal portion.
Claim 7
Dependent Claim
20 words
The invention according to claim 3, wherein said external portion is capable of assembly to snugly enclose said internal portion.
Claim 8
Dependent Claim
22 words
The invention according to claim 3, wherein said external portion is dimensioned to engage the entire surface area of said movable wall.
Claim 9
Dependent Claim
26 words
The invention according to claim 3, wherein said external portion comprises an annular member dimensioned to engage only a peripheral surface area of said movable wall.
Claim 10
Dependent Claim
18 words
The invention according to claim 3, wherein said external portion comprises a slab coextensive with said movable wall.
Claim 11
Dependent Claim
62 words
The invention according to claim 3, and further including means forming a plurality of separate cavities in said internal portion for containing individual masses of said powder particles; and means forming elongated holes in said internal portion, one hole assigned to each of said separate cavities and communicating therewith for containing separate wires for embedding in each of said individual powder masses.
Claim 12
Dependent Claim
21 words
The invention according to claim 3, wherein said soft elastomeric material has a Shore A hardness no greater than about 40.
Claim 13
Dependent Claim
16 words
The invention according to claim 9, wherein said soft elastomeric material is made of silicone rubber.
Claim 14
Dependent Claim
21 words
The invention according to claim 3, wherein said hard elastomeric material has a Shore A hardness of at least about 80.
Claim 15
Dependent Claim
15 words
The invention according to claim 11, wherein said hard elastomeric material is made of 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) | 1975-03-21 | 1975-09-20 | 1976-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-21 | 1979-09-20 | 1980-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-21 | 1983-09-20 | 1984-03-21 | $7700.00 | Window Closed / Lapsed |