US3765222A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Die for hydrostatic extrusion of sections having elongated projections
Assignee: ABB Norden Holding AB
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Filing: 1972-03-01
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Granted: 1973-10-16
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Expires: 1992-03-01
Abstract
Abstract For producing rods having longitudinally or helically extending projections or ribs by hydrostatic extrusion, the billet is extruded through a die having grooves, with the bases of the grooves inclined towards the longitudinal axis of the die so as to cause the material being extruded to fill the grooves of the die completely.
Inventors
- 👤 B Lundback
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:15
CPC Classifications
B; B21; B21C; B21C23/00; B21C23/007; B21C23/02; B21C23/04; B21C23/08; B21C23/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
53 words
Die having an extrusion orifice with a substantially circular central opening and grooves communicating therewith for producing rods having a central core part and elongated projections extending from said core part, by means of hydrostatic extrusion, the bases of the grooves in the die being inclined towards the longitudinal axis of the die.
Claim 2
Dependent Claim
53 words
Die having an extrusion orifice with a substantially circular central opening and grooves communicating therewith for producing rods having a central core part and elongated projections extending from said core part, by means of hydrostatic extrusion, the bases of the grooves in the die being inclined towards the longitudinal axis of the die.
Claim 3
Dependent Claim
25 words
Die according to claim 1, the grooves in the die decreasing in width from the inlet side towards the smallest cross-section of the die opening.
Claim 4
Dependent Claim
13 words
Die according to claim 1, in which the grooves are helical in shape.
Claim 5
Dependent Claim
68 words
Die according to claim 1 having a conical inlet, in which the projections between the grooves of the die are bevelled nearest to the smallest cross-section of the die so that the surfaces of the projections of the die between the grooves are directed towards the center of the die from a more acute angle to the longitudinal axis of the die than the surface of the inlet.
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) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |