US4684400A
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Method for controlling the oxygen content in agglomerated molybdenum powders
Assignee: Osram Sylvania Inc
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Filing: 1986-02-20
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Granted: 1987-08-04
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Expires: 2006-02-20
Abstract
Abstract A method is disclosed for introducing a controlled level of oxygen into agglomerated molybdenum metal powder, involving heating the powder at a sufficient temperature for a sufficient time in the presence of water vapor, and a non-oxidizing atmosphere with the amount of non-oxidizing atmosphere being controlled to produce a partially oxidized molybdenum powder.
Inventors
- 👤 Joseph E. Ritsko
- 👤 David J. Port
- 👤 David L. Houck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:06
CPC Classifications
C; C23; C23C; C23C8/00; C23C8/06; C23C8/08; C23C8/10; C23C8/16; C22; C22C; C22C32/00; C22C32/001; C22C32/0015; C22C32/0031; C22F; C22F1/00; C22F1/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
62 words
A method for introducing a controlled level of oxygen into agglomerated molybdenum metal powder, said method comprising heating said molybdenum powder at temperature of from about 700° C. to about 900° C. for a sufficient time in the presence of water vapor and a non-oxidizing atmosphere, with the amount of said non-oxidizing atmosphere being controlled to produce a partially oxidized molybdenum powder.
Claim 2
Independent Claim
62 words
A method for introducing a controlled level of oxygen into agglomerated molybdenum metal powder, said method comprising heating said molybdenum powder at temperature of from about 700° C. to about 900° C. for a sufficient time in the presence of water vapor and a non-oxidizing atmosphere, with the amount of said non-oxidizing atmosphere being controlled to produce a partially oxidized molybdenum powder.
Claim 3
Dependent Claim
11 words
A method of claim 2 wherein said non-oxidizing atmosphere is nitrogen.
Claim 4
Dependent Claim
24 words
A method of claim 3 wherein the oxygen content of said partially oxidized molybdenum powder is from about 3% to about 15% by weight.
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) | 1990-08-03 | 1991-02-02 | 1991-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-03 | 1995-02-02 | 1995-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-03 | 1999-02-02 | 1999-08-04 | $7700.00 | Window Closed / Lapsed |