Patent US3140964A successfully refreshed from Google Patents.
US3140964A
Expired / Lapsed
US
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Method of quenching pipe
Assignee: United States Steel Corp
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Filing: 1962-11-21
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Granted: 1964-07-14
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Expires: 1982-11-21
Abstract
No abstract record available.
Inventors
- 👤 Robert G Middlemiss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:10
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/08; C21D9/085
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
A METHOD OF HARDENING METAL PIPE COMPRISING ABUTTING AGAINST ONE END OF A PIPE A COVER PLATE HAVING A HOLE THEREIN THEREBY TO COMPLETELY SEAL THE INSIDE DIAMETER OPENING OF SAID PIPE END, HEATING SAID LENGTH ABOVE THE CRITICAL TEMPERATURE BY PASSING THE LENGTH THROUGH A HEATING ZONE WITH THE COVERED END TRAILING, THEN AS THE LENGTH EMERGES FROM SAID ZONE, PASSING IT THROUGH A LIQUID-SPRAY QUENCHING RING, SAID HOLE BEING DIMENSIONED TO DISSIPATE HEAT FROM THE INSIDE OF SAID TRAILING END TO SUCH AN EXTENT AS TO EFFECT TRANSFORMATION HARDENING THEREIN.
Claim 2
Independent Claim
92 words
A METHOD OF HARDENING METAL PIPE COMPRISING ABUTTING AGAINST ONE END OF A PIPE A COVER PLATE HAVING A HOLE THEREIN THEREBY TO COMPLETELY SEAL THE INSIDE DIAMETER OPENING OF SAID PIPE END, HEATING SAID LENGTH ABOVE THE CRITICAL TEMPERATURE BY PASSING THE LENGTH THROUGH A HEATING ZONE WITH THE COVERED END TRAILING, THEN AS THE LENGTH EMERGES FROM SAID ZONE, PASSING IT THROUGH A LIQUID-SPRAY QUENCHING RING, SAID HOLE BEING DIMENSIONED TO DISSIPATE HEAT FROM THE INSIDE OF SAID TRAILING END TO SUCH AN EXTENT AS TO EFFECT TRANSFORMATION HARDENING THEREIN.
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) | 1967-07-14 | 1968-01-13 | 1968-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-14 | 1972-01-13 | 1972-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-14 | 1976-01-13 | 1976-07-14 | $7700.00 | Window Closed / Lapsed |