US2890975A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for differential quenching of heat treated metallic articles
Assignee: Caterpillar Inc
•
Filing: 1955-04-26
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Granted: 1959-06-16
•
Expires: 1975-04-26
Abstract
No abstract record available.
Inventors
- 👤 Lenz Walter Harold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 00:21
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/62; C21D1/667
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
78 words
THE METHOD OF CONTROLLING THE HARDNESS PATTERN DEVELOPED IN A HEATED METALLIC ARTICLE UPON QUENCHING THEREOF WHICH COMPRISES SUBJECTING SAID ARTICLE TO A SUBSTANTIALLY CONTINUOUS SHEET OF THE SAME QUENCH FLUID THROUGHOUT SUCH SHEET AND WHICH HAS COEXISTING ZONES OF SAID FLUID WITH DIFFERENT HEAT ABSTRACTION PROPERTIES THAT ARE SUBSTANTIALLY INDEPENDENT OF THE HEAT ABSTRACTION PROPERTIES OF SAID FLUID WITHIN ADJACENT ZONES IN SAID SHEET; AND EFFECTING RELATIVE MOVEMENT BETWEEN SAID ARTICLE AND SAID SHEET OF QUENCH FLUID.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-06-15 | 1962-12-15 | 1963-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-06-15 | 1966-12-15 | 1967-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-06-15 | 1970-12-15 | 1971-06-16 | $7700.00 | Window Closed / Lapsed |