US2834871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for manufacturing welded cast iron tubes by electrical resistance welding
Assignee: Individual
•
Filing: 1952-08-02
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Granted: 1958-05-13
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Expires: 1972-08-02
Abstract
No abstract record available.
Inventors
- 👤 Manfred V Berg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:23
CPC Classifications
B; B23; B23K; B23K11/00; B23K11/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
THE METHOD OF PRODUCING WELDING CAST IRON ARTICLES WHICH COMPRISES: EFFECTING ELECTRIC CURRENT FLOW THROUGH PIECES BY FLASH WELDING MEANS, THE SAID PIECES OF CAST IRON HAVING A TOTAL PERCENTAGE OF CARBON WITHIN THE RANGE OF FROM 2.7 TO 3.6% WITH A MUTUAL VARIATION IN CARBON CONTENT NOT EXCEEDING 0.5% AND CONTAINING MORE TOTALLY BOUND CARBON THAN FREE GRAPHITE, A PERCENTAGE OF SILICON NOT EXCEEDING 1.9% AND A PERCENTAGE OF PHOSPHORUS NOT EXCEEDING 0.5%, WITH A MUTUAL VARIATION IN PHOSPHORUS CONTENT NOT EXCEEDING 0.2%, RAPIDLY COOLING THE WELD TO A TEMPERATURE OF ABOUT 500*C., AND SLOWY COOLING THE WELD FROM SAID TEMPERATURE OF ABOUT 500*C. TO ROOM TEMPERATURE.
Claim 2
Independent Claim
108 words
THE METHOD OF PRODUCING WELDING CAST IRON ARTICLES WHICH COMPRISES: EFFECTING ELECTRIC CURRENT FLOW THROUGH PIECES BY FLASH WELDING MEANS, THE SAID PIECES OF CAST IRON HAVING A TOTAL PERCENTAGE OF CARBON WITHIN THE RANGE OF FROM 2.7 TO 3.6% WITH A MUTUAL VARIATION IN CARBON CONTENT NOT EXCEEDING 0.5% AND CONTAINING MORE TOTALLY BOUND CARBON THAN FREE GRAPHITE, A PERCENTAGE OF SILICON NOT EXCEEDING 1.9% AND A PERCENTAGE OF PHOSPHORUS NOT EXCEEDING 0.5%, WITH A MUTUAL VARIATION IN PHOSPHORUS CONTENT NOT EXCEEDING 0.2%, RAPIDLY COOLING THE WELD TO A TEMPERATURE OF ABOUT 500*C., AND SLOWY COOLING THE WELD FROM SAID TEMPERATURE OF ABOUT 500*C. TO ROOM TEMPERATURE.
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) | 1961-05-12 | 1961-11-11 | 1962-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-12 | 1965-11-11 | 1966-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-12 | 1969-11-11 | 1970-05-13 | $7700.00 | Window Closed / Lapsed |