Patent US3153585A successfully refreshed from Google Patents.
US3153585A
Expired / Lapsed
US
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Adding sodium and phosphorus to a tungsten oxide reduction process to get large particle sizes
Assignee: GTE Sylvania Inc
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Filing: 1962-05-09
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Granted: 1964-10-20
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Expires: 1982-05-09
Abstract
No abstract record available.
Inventors
- 👤 Jr John M Laferty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:50
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/30; C22B34/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
A METHOD FOR PRODUCING TUNGSTEN POWDER WHICH COMPRISES THE STEPS OF THROUGHLY MIXING WITH TUNGSTEN OXIDE A SODIUM COMPOUND AND A PHOSPHORUS COMPOUND, THE AMOUNT OF EACH OF SAID COMPOUNDS BEING SUCH AS TO AFFORD IN THE RESULTING MIXTURE, EACH OF THE SODIUM AND PHOSPHORUS ELEMENTS, IN AN AMOUNT BETWEEN 0.01% AND 0.4% BY WEIGHT OF THE TUNGSTEN OXIDE AND THEREAFTER PASSING THE MIXTURE THROUGH A HYDROGEN ATMOSPHERE AT A TEMPERAUTURE SUFFICIENT TO CUASE THE REDUCTION OF TUNGSTEN OXIDE TO METALLIC TUNGSTEN.
Claim 2
Independent Claim
82 words
A METHOD FOR PRODUCING TUNGSTEN POWDER WHICH COMPRISES THE STEPS OF THROUGHLY MIXING WITH TUNGSTEN OXIDE A SODIUM COMPOUND AND A PHOSPHORUS COMPOUND, THE AMOUNT OF EACH OF SAID COMPOUNDS BEING SUCH AS TO AFFORD IN THE RESULTING MIXTURE, EACH OF THE SODIUM AND PHOSPHORUS ELEMENTS, IN AN AMOUNT BETWEEN 0.01% AND 0.4% BY WEIGHT OF THE TUNGSTEN OXIDE AND THEREAFTER PASSING THE MIXTURE THROUGH A HYDROGEN ATMOSPHERE AT A TEMPERAUTURE SUFFICIENT TO CUASE THE REDUCTION OF TUNGSTEN OXIDE TO METALLIC TUNGSTEN.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-10-20 | 1968-04-20 | 1968-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-10-20 | 1972-04-20 | 1972-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-10-20 | 1976-04-20 | 1976-10-20 | $7700.00 | Window Closed / Lapsed |