US3791799A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extrusion die
Assignee: Schwarzkopf Technologies Corp
•
Filing: 1971-01-29
•
Granted: 1974-02-12
•
Expires: 1991-01-29
Abstract
Abstract This invention relates to extrusion dies useful for processing both non-ferrous metals and alloy steels, the dies being made of a predominant amount of molybdenum or tungsten, the remainder being zirconia.
Inventors
- 👤 F Heitzinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:14
CPC Classifications
B; B21; B21C; B21C25/00; B21C25/02; B21C25/025
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
21 words
An extrusion die as in claim 1 wherein the zirconia phase contains zirconia and one or more stabilizers for the zirconia.
Claim 2
Dependent Claim
26 words
An extrusion die as in claim 1 wherein the stabilizer for the zirconia phase is selected from among the oxides of calcium, magnesium, cerium and yttrium.
Claim 3
Dependent Claim
13 words
An extrusion die as in claim 1 consisting essentially of molybdenum and zirconia.
Claim 4
Dependent Claim
13 words
An extrusion die as in claim 1 consisting essentially of tungsten and zirconia.
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) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |