Patent US2992916A successfully refreshed from Google Patents.
US2992916A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of calcium tungstate
Assignee: General Electric Co
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Filing: 1958-09-10
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Granted: 1961-07-18
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Expires: 1978-09-10
Abstract
No abstract record available.
Inventors
- 👤 Arthur E Newkirk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:34
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/30; C22B34/36; C22B5/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
49 words
THE PROCESS OF PREPARING REACTIVE TUNGSTEN WHICH CONSISTS OF REDUCING CALCIUM TUNGSTATE WITH HYDROGEN, CONVERTING THE CALCIUM RESIDUE IN THE HYDROGEN-REDUCED PRODUCT TO A WATER-SOLUBLE CALCILUM COMPOUND BY REACTION WITH A CALCIUM WATER-SOLUBILIZING AGENT AND THEREAFTER WASHING THE TUNGSTEN UNTIL IT IS SUBSTANTIALLY FREE OF THE SOLUBILIZED CALCIUM RESIDUE.
Claim 2
Dependent Claim
49 words
THE PROCESS OF PREPARING REACTIVE TUNGSTEN WHICH CONSISTS OF REDUCING CALCIUM TUNGSTATE WITH HYDROGEN, CONVERTING THE CALCIUM RESIDUE IN THE HYDROGEN-REDUCED PRODUCT TO A WATER-SOLUBLE CALCILUM COMPOUND BY REACTION WITH A CALCIUM WATER-SOLUBILIZING AGENT AND THEREAFTER WASHING THE TUNGSTEN UNTIL IT IS SUBSTANTIALLY FREE OF THE SOLUBILIZED CALCIUM RESIDUE.
References Cited (Backward Citations)
US1217913A
Cited
US2829926A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-17 | 1965-01-16 | 1965-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-17 | 1969-01-16 | 1969-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-17 | 1973-01-16 | 1973-07-18 | $7700.00 | Window Closed / Lapsed |