Patent US3201290A successfully refreshed from Google Patents.
US3201290A
Expired / Lapsed
US
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Process for automatically controlled carburizing of the surface layer of steel articles
Assignee: Maag Gear Wheel and Machine Co Ltd
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Filing: 1963-09-24
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Granted: 1965-08-17
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Expires: 1983-09-24
Abstract
No abstract record available.
Inventors
- 👤 Wyss Urs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:07
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/74; C21D1/76; C23; C23C; C23C8/00; C23C8/06; C23C8/08; C23C8/20; C23C8/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
PROCESS FOR AUTOMATICALLY CONTROLLED CARBURIZING OF THE SURFACE LAYER OF STEEL ARTICLES IN A FURNACE CHAMBER BY GAS CARBURIZING IN A GAS ATMOSPHERE FORMED IN SUCH FURNACE CHAMBER BY THERMAL CRACKING AT USUAL CARBURIZING TEMPERATURE (850-1000*C.) CHARACTERISED IN FEEDING INTO SUCH CHAMBER A COMBINATION OF ORGANIC SUBSTANCE, OF WHICH AT CARBURIZING TEMPERATURE ONE YIELDS A GAS, PRODUCING A POSITIVE PRESSURE, AND ANOTHER YIELDS A CARBURIZING GAS, THE COMBINATION OF SAID SUBSTANCE BEING SUCH THAT, AFTER THE CRACKING AND THE CARBURIZING REACTIONS, THE GASES RESULTING THEREFROM AND PROVIDING THE GAS ATMOSPHERE IN THE FURNANCE CHAMBER HAVE SUBSTANTIALLY THE SAME COMPOSITION AS EACH OTHER AND MAINTAINING SUCH
Claim 2
Dependent Claim
105 words
PROCESS FOR AUTOMATICALLY CONTROLLED CARBURIZING OF THE SURFACE LAYER OF STEEL ARTICLES IN A FURNACE CHAMBER BY GAS CARBURIZING IN A GAS ATMOSPHERE FORMED IN SUCH FURNACE CHAMBER BY THERMAL CRACKING AT USUAL CARBURIZING TEMPERATURE (850-1000*C.) CHARACTERISED IN FEEDING INTO SUCH CHAMBER A COMBINATION OF ORGANIC SUBSTANCE, OF WHICH AT CARBURIZING TEMPERATURE ONE YIELDS A GAS, PRODUCING A POSITIVE PRESSURE, AND ANOTHER YIELDS A CARBURIZING GAS, THE COMBINATION OF SAID SUBSTANCE BEING SUCH THAT, AFTER THE CRACKING AND THE CARBURIZING REACTIONS, THE GASES RESULTING THEREFROM AND PROVIDING THE GAS ATMOSPHERE IN THE FURNANCE CHAMBER HAVE SUBSTANTIALLY THE SAME COMPOSITION AS EACH OTHER AND MAINTAINING SUCH
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) | 1968-08-16 | 1969-02-15 | 1969-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-16 | 1973-02-15 | 1973-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-16 | 1977-02-15 | 1977-08-17 | $7700.00 | Window Closed / Lapsed |