US2804412A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carburization of metal articles
Assignee: Gardner Denver Inc
•
Filing: 1955-12-22
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Granted: 1957-08-27
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Expires: 1975-12-22
Abstract
No abstract record available.
Inventors
- 👤 Floyd R Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:57
CPC Classifications
E; E21; E21B; E21B17/00; C; C23; C23C; C23C8/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
85 words
A METHOD OF CARBURIZING A STEEL DRILL ROD HAVING AN AXIAL BORE THAT COMPRISES FILLING THE BORE WITH PARTICULATE CARBURIZING MATERIAL, CLOSING OFF THE ENDS OF THE BORE TO RETAIN THE PARTICULATE MATERIAL THEREIN, SEALING THE ENDS OF THE BORE, SUSPENDING THE ROD FROM ONE OF ITS ENDS, HEATING THE ROD TO CARBURIZING TEMPERATURE IN THE PRESENCE OF A CARBURIZING FLUID, AND THEN QUENCHING THE ROD BY CONTACTING THE OUTSIDE SURFACE ONLY WITH QUENCHING LIQUID, WHILE RETAINING THE SEAL OF THE ENDS OF THE BORE.
Claim 2
Independent Claim
85 words
A METHOD OF CARBURIZING A STEEL DRILL ROD HAVING AN AXIAL BORE THAT COMPRISES FILLING THE BORE WITH PARTICULATE CARBURIZING MATERIAL, CLOSING OFF THE ENDS OF THE BORE TO RETAIN THE PARTICULATE MATERIAL THEREIN, SEALING THE ENDS OF THE BORE, SUSPENDING THE ROD FROM ONE OF ITS ENDS, HEATING THE ROD TO CARBURIZING TEMPERATURE IN THE PRESENCE OF A CARBURIZING FLUID, AND THEN QUENCHING THE ROD BY CONTACTING THE OUTSIDE SURFACE ONLY WITH QUENCHING LIQUID, WHILE RETAINING THE SEAL OF THE ENDS OF THE BORE.
References Cited (Backward Citations)
US1459409A
Cited
US2398809A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-26 | 1961-02-25 | 1961-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-26 | 1965-02-25 | 1965-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-26 | 1969-02-25 | 1969-08-27 | $7700.00 | Window Closed / Lapsed |