Patent US3475159A successfully refreshed from Google Patents.
US3475159A
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Method for preparing tungsten powders doped with refractory metal oxides
Assignee: Dow Chemical Co
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Filing: 1967-01-16
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Granted: 1969-10-28
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Expires: 1987-01-16
Abstract
No abstract record available.
Inventors
- 👤 Robert D Hansen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:01
CPC Classifications
B; B22; B22F; B22F9/00; B22F9/16; B22F9/18; C; C22; C22B; C22B34/00; C22B34/30; C22B34/36; C22C; C22C1/00; C22C1/10; C22C1/1026; Y; Y10; Y10S; Y10S75/00; Y10S75/956
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1089757A
Cited
US1662027A
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US2244325A
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US2489912A
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US3278281A
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US3054654A
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US3231329A
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US3284230A
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US3351438A
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US3271142A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-27 | 1973-04-28 | 1973-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-27 | 1977-04-28 | 1977-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-27 | 1981-04-28 | 1981-10-28 | $7700.00 | Window Closed / Lapsed |