Patent US4600448A successfully refreshed from Google Patents.
US4600448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copper-tantalum alloy
Assignee: Iowa State University Research Foundation Inc
•
Filing: 1984-07-31
•
Granted: 1986-07-15
•
Expires: 2004-07-31
Abstract
Abstract A tantalum-copper alloy can be made by preparing a consumable electrode consisting of an elongated copper billet containing at least two spaced apart tantalum rods extending longitudinally the length of the billet. The electrode is placed in a dc arc furnace and melted under conditions which co-melt the copper and tantalum to form the alloy.
Inventors
- 👤 Frederick A. Schmidt
- 👤 John D. Verhoeven
- 👤 Edwin D. Gibson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:55
CPC Classifications
C; C22; C22C; C22C9/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
15 words
A cast tantalum-copper alloy wherein the alloy contains up to about 50 weight percent tantalum.
Claim 2
Dependent Claim
15 words
A cast tantalum-copper alloy wherein the alloy contains up to about 50 weight percent tantalum.
Claim 3
Dependent Claim
22 words
The tantalum-copper alloy of claim 1 wherein the tantalum is present in the copper as discrete, randomly distributed and oriented dendritic-shaped particles.
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) | 1989-07-14 | 1990-01-13 | 1990-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-14 | 1994-01-13 | 1994-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-14 | 1998-01-13 | 1998-07-15 | $7700.00 | Window Closed / Lapsed |