US4412752A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for determining the cooling characteristics of a quenching medium
Assignee: Navistar International Corp
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Filing: 1981-09-21
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Granted: 1983-11-01
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Expires: 2001-09-21
Abstract
Abstract A method and apparatus for determining the cooling characteristics of a quenching medium includes a temperature probe having a predetermined thermal mass and conductivity and a temperature sensor affixed to the probe. The probe and sensor are heated to a predetermined temperature and immersed in the quenching medium. The output of the temperature sensor is applied to a microcomputer that has been programmed to monitor the quench rate and to determine whether the quench rate is within predetermined limits at predetermined temperatures.
Inventors
- 👤 Raymond A. Cellitti
- 👤 John J. Connelly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:58
CPC Classifications
G; G01; G01N; G01N25/00; G01N25/18; G01N33/00; G01N33/26; G01N33/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
A method for determining an appropriate quenching medium for producing predetermined characteristics in a production part comprising the steps of: determining the desired characteristics of the production part; defining on a temperature transformation diagram the cooling characteristic required to obtain said desired characteristic; immersing a heat test probe into a quenching medium and measuring the time versus temperature characteristic of the test probe, where said test probe has the same shape and same thermal conductivity as said production part; and adjusting the characteristic of the quenching medium until the desired time versus temperature characteristic is obtained.
Claim 2
Independent Claim
96 words
A method for determining an appropriate quenching medium for producing predetermined characteristics in a production part comprising the steps of: determining the desired characteristics of the production part; defining on a temperature transformation diagram the cooling characteristic required to obtain said desired characteristic; immersing a heat test probe into a quenching medium and measuring the time versus temperature characteristic of the test probe, where said test probe has the same shape and same thermal conductivity as said production part; and adjusting the characteristic of the quenching medium until the desired time versus temperature characteristic is obtained.
References Cited (Backward Citations)
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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) | 1986-10-31 | 1987-05-02 | 1987-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-31 | 1991-05-02 | 1991-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-31 | 1995-05-02 | 1995-11-01 | $7700.00 | Window Closed / Lapsed |