Patent US3270413A successfully refreshed from Google Patents.
US3270413A
Expired / Lapsed
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Process for producing a diffusionless bond between metals
Assignee: Atomic Energy of Canada Ltd AECL
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Filing: 1963-12-02
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Granted: 1966-09-06
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Expires: 1983-12-02
Abstract
No abstract record available.
Inventors
- 👤 Robert D Watson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:29
CPC Classifications
B; B23; B23K; B23K31/00; B23K31/02; G; G21; G21C; G21C21/00; G21C21/02; Y; Y02; Y02E; Y02E30/00; Y02E30/30; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4998; Y10T29/49982
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
105 words
A METHOD OF FORMING A LEAK-PROOF BOND BETWEEN ALUMINUM AND ONE OF THE METALS OF THE GROUP ZIRCONIUM, ZIRCONIUM ALLOYS, URANIUM, AND STAINLESS STEEL COMPRISING: (A) FORMING A THIN OXIDE LAYER ON THE SURFACE OF A TUBE OF THE METAL TO BE BOUNDED, (B) HEATING THE SAME TUBE TO A TEMPERATURE IN THE RANGE 400*C. TO 600*C., (C) ROTATING THE TUBE ON A MANDREL SLOWLY UNDER THE ORIFICE OF AN EXTRUSION DIE, AND (D) EXTRUDING AN ENCIRCLING BUILT-UP LAYER OF ALUMINUM ONTO THE OXIDIZED SURFACE OF THE TUBE, SAID ALUMINUM HAVING BEEN HEATED IN THE DIE PRIOR TO EXTRUSION TO A TEMPERATURE OF APPROXIMATELY 500*C.
Claim 2
Independent Claim
105 words
A METHOD OF FORMING A LEAK-PROOF BOND BETWEEN ALUMINUM AND ONE OF THE METALS OF THE GROUP ZIRCONIUM, ZIRCONIUM ALLOYS, URANIUM, AND STAINLESS STEEL COMPRISING: (A) FORMING A THIN OXIDE LAYER ON THE SURFACE OF A TUBE OF THE METAL TO BE BOUNDED, (B) HEATING THE SAME TUBE TO A TEMPERATURE IN THE RANGE 400*C. TO 600*C., (C) ROTATING THE TUBE ON A MANDREL SLOWLY UNDER THE ORIFICE OF AN EXTRUSION DIE, AND (D) EXTRUDING AN ENCIRCLING BUILT-UP LAYER OF ALUMINUM ONTO THE OXIDIZED SURFACE OF THE TUBE, SAID ALUMINUM HAVING BEEN HEATED IN THE DIE PRIOR TO EXTRUSION TO A TEMPERATURE OF APPROXIMATELY 500*C.
Claim 3
Independent Claim
124 words
A METHOD OF PREPARING TUBES MADE OF THE METAL OF THE GROUP ZIRCONIUM, ZIRCONIUM ALLOYS, URANIUM, AND STAINLESS STEEL FOR SUBSEQUENT FABRICATION IN THE FIELD COMPRISING: (A) FORMING A THIN OXIDE LAYER ON THE SURFACE OF A TUBE OF THE METAL TO BE EMPLOYED, (B) PRE-HEATING THE SAID TUBE TO A TEMPERATURE IN THE RANGE 400*C. TO 600*C., (C) EXTRUDING AN ENCIRCLING, BUILT-UP LAYER OF ALUMINUM ONTO THE SURFACE OF THE TUBE ADJACENT ONE END THEREOF, SAID ALUMINUM HAVING BEEN HEATED PRIOR TO EXTRUSION TO A TEMPERATURE OF APPROXIMATELY 500*C., AND (D) CUTTING AWAY A PORTION OF THE TUBE TO LEAVE AN EXTENDING COLLAR OF ALUMINUM, SAID COLLAR BEING SUCH THAT SUBSEQUENT JOINING OF THE ALUMINUM COLLAR TO ANOTHER ALUMINUM TUBE IS READILY ACHIEVED.
Claim 4
Independent Claim
124 words
A METHOD OF PREPARING TUBES MADE OF THE METAL OF THE GROUP ZIRCONIUM, ZIRCONIUM ALLOYS, URANIUM, AND STAINLESS STEEL FOR SUBSEQUENT FABRICATION IN THE FIELD COMPRISING: (A) FORMING A THIN OXIDE LAYER ON THE SURFACE OF A TUBE OF THE METAL TO BE EMPLOYED, (B) PRE-HEATING THE SAID TUBE TO A TEMPERATURE IN THE RANGE 400*C. TO 600*C., (C) EXTRUDING AN ENCIRCLING, BUILT-UP LAYER OF ALUMINUM ONTO THE SURFACE OF THE TUBE ADJACENT ONE END THEREOF, SAID ALUMINUM HAVING BEEN HEATED PRIOR TO EXTRUSION TO A TEMPERATURE OF APPROXIMATELY 500*C., AND (D) CUTTING AWAY A PORTION OF THE TUBE TO LEAVE AN EXTENDING COLLAR OF ALUMINUM, SAID COLLAR BEING SUCH THAT SUBSEQUENT JOINING OF THE ALUMINUM COLLAR TO ANOTHER ALUMINUM TUBE IS READILY ACHIEVED.
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) | 1969-09-05 | 1970-03-07 | 1970-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-05 | 1974-03-07 | 1974-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-05 | 1978-03-07 | 1978-09-06 | $7700.00 | Window Closed / Lapsed |