Patent US3170234A successfully refreshed from Google Patents.
US3170234A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Jointing of refractory metals by solidstate diffusion bonding
Assignee: Individual
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Filing: 1962-09-17
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Granted: 1965-02-23
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Expires: 1982-09-17
Abstract
No abstract record available.
Inventors
- 👤 Charles O Tarr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:14
CPC Classifications
B; B23; B23K; B23K20/00; B23K20/22; B23K20/233
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
74 words
THE METHOD OF JOINING REFRACTORY METALS IN THE GROUP CONSISTING OF TUNGSTEN, TANTALUM, COLUMBIUM, MOLYBDENUM, RHENIUM AND VANADIUM AND ALLOYS CONSISTING OF A COMBINATION THEREOF TO THEMSELVES AND ONE ANOTHER WHICH COMPRISES BRINGING SMOOTH OXIDE-FREE SURFACES OF SAID METALS INTO CONTACT AT A RELATIVELY LOW PRESSURE AND AT A TEMPERATURE OF AT LEAST 1350*C. AND BELOW THE MELTING POINT OF THE LOWEST-MELTING METAL BEING JOINED IN A PROTECTIVE ATMOSPHERE, WHEREBY SAID SURFACES ARE BONDED.
Claim 2
Independent Claim
74 words
THE METHOD OF JOINING REFRACTORY METALS IN THE GROUP CONSISTING OF TUNGSTEN, TANTALUM, COLUMBIUM, MOLYBDENUM, RHENIUM AND VANADIUM AND ALLOYS CONSISTING OF A COMBINATION THEREOF TO THEMSELVES AND ONE ANOTHER WHICH COMPRISES BRINGING SMOOTH OXIDE-FREE SURFACES OF SAID METALS INTO CONTACT AT A RELATIVELY LOW PRESSURE AND AT A TEMPERATURE OF AT LEAST 1350*C. AND BELOW THE MELTING POINT OF THE LOWEST-MELTING METAL BEING JOINED IN A PROTECTIVE ATMOSPHERE, WHEREBY SAID SURFACES ARE BONDED.
Claim 3
Independent Claim
90 words
THE METHOD OF JOINING REFRACTORY METAL PARTS CONSISTING OF AT LEAST ONE REFRACTORY METAL IN THE GROUP CONSISTING OF TUNGSTEN, TANTALUM, RHENIUM, COLUMBIUM, MOLYBDENUM AND VANADIUM AND ALLOY COPMBINATIONS THEREOF WHICH COMPRISES INTERPOSING A THIN LAYER OF A METAL SELECTED FROM SAID GROUP BETWEEN SAID PARTS AND BRINGING OXIDE-FREE SURFACES OF SAID PARTS AND SAID LAYER INTO CONTACT AT A RELATIVELY LOW PRESSURE UNDER VACUUM AT A TEMPERATURE OF AT LEAST ABOUT 1350*C. AND BELOW THE MELTING POINTS OF SAID PARTS AND SAID LAYER WHEREBY SAID PARTS ARE BONDED TOGETHER.
Claim 4
Independent Claim
90 words
THE METHOD OF JOINING REFRACTORY METAL PARTS CONSISTING OF AT LEAST ONE REFRACTORY METAL IN THE GROUP CONSISTING OF TUNGSTEN, TANTALUM, RHENIUM, COLUMBIUM, MOLYBDENUM AND VANADIUM AND ALLOY COPMBINATIONS THEREOF WHICH COMPRISES INTERPOSING A THIN LAYER OF A METAL SELECTED FROM SAID GROUP BETWEEN SAID PARTS AND BRINGING OXIDE-FREE SURFACES OF SAID PARTS AND SAID LAYER INTO CONTACT AT A RELATIVELY LOW PRESSURE UNDER VACUUM AT A TEMPERATURE OF AT LEAST ABOUT 1350*C. AND BELOW THE MELTING POINTS OF SAID PARTS AND SAID LAYER WHEREBY SAID PARTS ARE BONDED TOGETHER.
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) | 1968-02-23 | 1968-08-24 | 1969-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-02-23 | 1972-08-24 | 1973-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-02-23 | 1976-08-24 | 1977-02-23 | $7700.00 | Window Closed / Lapsed |