US4612073A
Expired / Lapsed
US
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Aluminum grain refiner containing duplex crystals
Assignee: KB Alloys Inc
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Filing: 1984-08-02
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Granted: 1986-09-16
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Expires: 2004-08-02
Abstract
Abstract Disclosed is a new aluminum grain refiner alloy with a controlled, effective content of "duplex" crystals. The duplex crystals are made by (1) producing aluminides that contain boron in solution, and by (2) aging said aluminide in a manner to precipitate at least part of the boron to form the duplex crystals. The duplex crystals have been discovered to be extremely potent grain refining agents.
Inventors
- 👤 Matthew M. Guzowski
- 👤 David A. Sentner
- 👤 Geoffrey K. Sigworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:55
CPC Classifications
C; C22; C22C; C22C21/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
74 words
A grain refiner that contains more than 5% duplex crystals obtained by producing aluminide crystals containing boron in solution, and aging said aluminide crystals for a sufficient time and temperature to precipitate at least part of the boron to form said duplex crystals having a structure of (Ti+B)Al 3 said grain refiner consisting essentially of, in weight percent, 0.5 to 5 boron, 2 to 12 percent titanium and the balance aluminum plus normal impurities.
Claim 2
Dependent Claim
74 words
A grain refiner that contains more than 5% duplex crystals obtained by producing aluminide crystals containing boron in solution, and aging said aluminide crystals for a sufficient time and temperature to precipitate at least part of the boron to form said duplex crystals having a structure of (Ti+B)Al 3 said grain refiner consisting essentially of, in weight percent, 0.5 to 5 boron, 2 to 12 percent titanium and the balance aluminum plus normal impurities.
Claim 3
Dependent Claim
23 words
The grain refiner of claim 1 wherein the combination of aging time and temperatures employed fall between the dashed lines of FIG. 5.
References Cited (Backward Citations)
US3785807A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-09-15 | 1990-03-17 | 1990-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-15 | 1994-03-17 | 1994-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-15 | 1998-03-17 | 1998-09-16 | $7700.00 | Window Closed / Lapsed |