Patent US5162691A successfully refreshed from Google Patents.
Patent US3240639A successfully refreshed from Google Patents.
US3240639A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ferro-carbon alloys of improved microstructure and process for their manufacture
Assignee: Individual
•
Filing: 1963-03-27
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Granted: 1966-03-15
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Expires: 1983-03-27
Abstract
No abstract record available.
Inventors
- 👤 Lihl Franz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:03
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/06; C21D1/09; Y; Y10; Y10S; Y10S148/00; Y10S148/902; Y10S148/903
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
A SURFACE HARDENING PROCESS FOR THE PRODUCTION OF AN IMPROVED HOMOGENEOUS STEEL MICROSTRUCTURE WHICH COMPRISES HEATING THE SURFACE OF A HARDENABLE STEEL STRUCTURE TO A TEMPERATURE BETWEEN ABOUT 1000*C. AND THE LIQUIDS POINT WITHIN A TIME PERIOD NOT LONGER THAN ABOUT 0.1 SECOND, AND THEREAFTER IMMEDIATELY COOLING SAID STEEL BY SELF-QUENCHING FROM THAT TEMPERATURE DOWN TO A TEMPERATURE IN THE RANGE BETWEEN ABOUT 600*C. AND ROOM TEMPERATURE WITHIN A TIME PERIOD OF AT MOST ABOUT 0.01 SECOND.
Claim 2
Dependent Claim
77 words
A SURFACE HARDENING PROCESS FOR THE PRODUCTION OF AN IMPROVED HOMOGENEOUS STEEL MICROSTRUCTURE WHICH COMPRISES HEATING THE SURFACE OF A HARDENABLE STEEL STRUCTURE TO A TEMPERATURE BETWEEN ABOUT 1000*C. AND THE LIQUIDS POINT WITHIN A TIME PERIOD NOT LONGER THAN ABOUT 0.1 SECOND, AND THEREAFTER IMMEDIATELY COOLING SAID STEEL BY SELF-QUENCHING FROM THAT TEMPERATURE DOWN TO A TEMPERATURE IN THE RANGE BETWEEN ABOUT 600*C. AND ROOM TEMPERATURE WITHIN A TIME PERIOD OF AT MOST ABOUT 0.01 SECOND.
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) | 1969-03-14 | 1969-09-13 | 1970-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-14 | 1973-09-13 | 1974-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-14 | 1977-09-13 | 1978-03-15 | $7700.00 | Window Closed / Lapsed |