Patent US3175903A successfully refreshed from Google Patents.
US3175903A
Expired / Lapsed
US
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Process for forming porous tungsten
Assignee: Bendix Corp
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Filing: 1963-06-10
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Granted: 1965-03-30
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Expires: 1983-06-10
Abstract
No abstract record available.
Inventors
- 👤 Robert H Herron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:13
CPC Classifications
B; B22; B22F; B22F3/00; B22F3/10; B22F3/11; B22F2998/00; B22F2998/10; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12153; Y10T428/1216; Y10T428/12174; Y10T428/12493; Y10T428/12771; Y10T428/12806; Y10T428/12826; Y10T428/1284
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
A PROCESS FOR FORMING A POROUS TUNGSTEN ARTICLE COMPRISING THE STEPS OF: FORMING AUNIFORMLY BLENDED POWDER MIXTURE CONSISTING OF .05% TO 3% BY WEIGHT OF NICKEL AND THE BLANCE SUBSTANTIALLY ALL TUNGSTEN; COMPACTING SAID POWDERED MIXTURE TO FORM A BRIQUETTE; SINTERING SAID BRIQUETTE TO INDUCE GROWTH OF THE TUNGSTEN PARTICLES WITHIN SAID BRIQUETTE TO A PREDETERMINED SIZE SUBSTANTIALLY GREATER THAN THE TUNGSTEN PARTICLE SIZE WITHIN SAID POWDER MIXTURE; BREAKING SAID BRIQUETTE AT THE GRAIN BOUNDARIES TO FORM A LOOSE POWDER OF LARGE GRAIN SIZE TUNSTEN PARTICLES; COMPACTING SAID LARGE GRAIN SIZE TUNGSTEN POWDER INTO A BRIQUETTE OF FINAL ARTICLE SHAPE; SINTERING SAID BRIQUETTE OF FINAL ARTICLE SHAPE TO FORM A SINTERED POROUS ARTICLE.
Claim 2
Dependent Claim
113 words
A PROCESS FOR FORMING A POROUS TUNGSTEN ARTICLE COMPRISING THE STEPS OF: FORMING AUNIFORMLY BLENDED POWDER MIXTURE CONSISTING OF .05% TO 3% BY WEIGHT OF NICKEL AND THE BLANCE SUBSTANTIALLY ALL TUNGSTEN; COMPACTING SAID POWDERED MIXTURE TO FORM A BRIQUETTE; SINTERING SAID BRIQUETTE TO INDUCE GROWTH OF THE TUNGSTEN PARTICLES WITHIN SAID BRIQUETTE TO A PREDETERMINED SIZE SUBSTANTIALLY GREATER THAN THE TUNGSTEN PARTICLE SIZE WITHIN SAID POWDER MIXTURE; BREAKING SAID BRIQUETTE AT THE GRAIN BOUNDARIES TO FORM A LOOSE POWDER OF LARGE GRAIN SIZE TUNSTEN PARTICLES; COMPACTING SAID LARGE GRAIN SIZE TUNGSTEN POWDER INTO A BRIQUETTE OF FINAL ARTICLE SHAPE; SINTERING SAID BRIQUETTE OF FINAL ARTICLE SHAPE TO FORM A SINTERED POROUS ARTICLE.
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) | 1968-03-29 | 1968-09-28 | 1969-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-29 | 1972-09-28 | 1973-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-29 | 1976-09-28 | 1977-03-30 | $7700.00 | Window Closed / Lapsed |