US4385881A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultrahigh pressure apparatus
Assignee: Individual
•
Filing: 1981-04-08
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Granted: 1983-05-31
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Expires: 2001-04-08
Abstract
Abstract An improved ultrahigh pressure apparatus which comprises; a pair of opposed frustoconical punches, an annular die which has a central bore therethrough formed straight-cylindrical at least partially at an inner portion and which is placed between and in alignment with said punches, a rigid hollow cylinder which is placed in a circumferential contact with the straight cylindrical bore face of the die, and a pair of gaskets of a readily deformable material which are each placed around a conical face of punches and adjacent to a bore face portion of the die outside the rigid cylinder and to an orifice of said cylinder, which apparatus is characterized in that said rigid hollow cylinder has a bore face formed substantially quarter-circular or quarter-elliptical, in a radial section taken along an axis thereof, starting at either axial end and ending at a central portion thereof.
Inventors
- 👤 Hiroshi Ishizuka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:57
CPC Classifications
B; B01; B01J; B01J3/00; B01J3/06; B01J3/065; B30; B30B; B30B11/00; B30B11/004
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
146 words
An ultrahigh pressure apparatus comprising: a pair of opposed frustoconical punches, an annular die whose bore face includes an innermost portion of substantially straight-cylindrical configuration and placed between- and in alignment with the punches, a rigid hollow cylinder placed in circumferential contact with said straight-cylindrical portion of the bore face, gaskets of readily deformable material placed around the conical face of the punches and abutting the cylinder and the outer portion of the bore face of the die on each side of the cylinder, said rigid cylinder having a curved bore face which exhibits, at a radial cross section of the cylinder taken along the axis, a contour selected from quarter-circular and quarter-elliptical contours between each end and the center of said axis, and said cylinder exhibits a diameter at the minimum opening thereof substantially equal to that of the punches at the smaller end thereof.
Claim 2
Dependent Claim
146 words
An ultrahigh pressure apparatus comprising: a pair of opposed frustoconical punches, an annular die whose bore face includes an innermost portion of substantially straight-cylindrical configuration and placed between- and in alignment with the punches, a rigid hollow cylinder placed in circumferential contact with said straight-cylindrical portion of the bore face, gaskets of readily deformable material placed around the conical face of the punches and abutting the cylinder and the outer portion of the bore face of the die on each side of the cylinder, said rigid cylinder having a curved bore face which exhibits, at a radial cross section of the cylinder taken along the axis, a contour selected from quarter-circular and quarter-elliptical contours between each end and the center of said axis, and said cylinder exhibits a diameter at the minimum opening thereof substantially equal to that of the punches at the smaller end thereof.
Claim 3
Dependent Claim
30 words
The apparatus according to claim 1, in which said quarter-circular contour of the rigid cylinder is curved at a radius substantially equal to half the axial length of the axis.
Claim 4
Dependent Claim
28 words
The apparatus according to claim 1, in which said quarter-elliptical contour of the cylinder exhibits a major axis substantially equal to the overall axial length of the cylinder.
Claim 5
Dependent Claim
27 words
The apparatus according to claim 1, in which said quarter-elliptical contour of the cylinder exhibits major and minor axes whose ratio is not in excess of two.
Claim 6
Dependent Claim
23 words
The apparatus according to claim 1, in which said cylinder is substantially made of alumina material sintered to be substantially free of pores.
Claim 7
Dependent Claim
23 words
The apparatus according to claim 1, in which said die is made of such hardened steel as die steel or high speed steel.
References Cited (Backward Citations)
US2941247A
Cited
US2941248A
Cited
US3365751A
Cited
US3350743A
Cited
US3313004A
Cited
GB1213714A
Cited
US3727028A
Cited
US4097208A
Cited
US3988087A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-05-30 | 1986-11-29 | 1987-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-30 | 1990-11-29 | 1991-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-30 | 1994-11-29 | 1995-05-31 | $7700.00 | Window Closed / Lapsed |