Patent US2804413A successfully refreshed from Google Patents.
US2804413A
Expired / Lapsed
US
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Carburization of metal articles
Assignee: Gardner Denver Inc
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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
- 👤 Benjamin C Essig
- 👤 Floyd R Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:11
CPC Classifications
C; C23; C23C; C23C8/00; C23C8/60; C23C8/62; C23C8/64; C23C8/66
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
71 words
A METHOD OF CASE HARDENING SURFACE PORTIONS OF A FERROUS METAL ARTICLE HAVING AT LEAST ONE OPENING THEREIN, WHICH COMPRISES FORCE-FITTING A PLUG FORMED OF THIN LOW CARBON STEEL SHEET WHICH BECOMES BRITTLE UPON CARBURIZATION AND QUENCHING INTO THE OPENING TO SEAL THE SAME, CARBURIZING THE SURFACE PORTIONS AND SIMULTANEOUSLY THE ENTIRE BODY OF THE PLUG, QUENCHING THE ARTICLE AND THEREAFTER BREAKING THE PLUG TO REMOVE THE SAME FROM THE OPENING.
Claim 2
Independent Claim
71 words
A METHOD OF CASE HARDENING SURFACE PORTIONS OF A FERROUS METAL ARTICLE HAVING AT LEAST ONE OPENING THEREIN, WHICH COMPRISES FORCE-FITTING A PLUG FORMED OF THIN LOW CARBON STEEL SHEET WHICH BECOMES BRITTLE UPON CARBURIZATION AND QUENCHING INTO THE OPENING TO SEAL THE SAME, CARBURIZING THE SURFACE PORTIONS AND SIMULTANEOUSLY THE ENTIRE BODY OF THE PLUG, QUENCHING THE ARTICLE AND THEREAFTER BREAKING THE PLUG TO REMOVE THE SAME FROM THE OPENING.
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 |