US2798832A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of hardening ferrous metals
Assignee: Individual
•
Filing: 1954-03-08
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Granted: 1957-07-09
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Expires: 1974-03-08
Abstract
No abstract record available.
Inventors
- 👤 Richard F Harvey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:31
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/56; C21D1/04; C21D1/62; C21D1/63; Y; Y10; Y10S; Y10S29/00; Y10S29/046
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
IN A PROCESS OF HARDENING FERROUS METALS BY QUENCHING FROM ABOVE THE CRITICAL TEMPERATURE IN A LIQUID QUENCHING MEDIUM,THE STEP OF SUBJECTING THE SAID QUENCHING MEDIUM TO THE INFLUENCE OF SONIC VIBRATIONS OF FREQUENCIES BETWEEN ABOUT 100 CYCLES PER SECOND AND 5 MEGACYCLES PER SECOND UNDER CONDITIONS OF RESONANCE THEREBY INCREASING THE DEGREE OF AGITATION AND TURBULENCE TO PRODUCE CAVITATION AND TO PROVIDE FASTER QUENCHING OF THE SAID FERROUS METALS.
Claim 2
Dependent Claim
70 words
IN A PROCESS OF HARDENING FERROUS METALS BY QUENCHING FROM ABOVE THE CRITICAL TEMPERATURE IN A LIQUID QUENCHING MEDIUM,THE STEP OF SUBJECTING THE SAID QUENCHING MEDIUM TO THE INFLUENCE OF SONIC VIBRATIONS OF FREQUENCIES BETWEEN ABOUT 100 CYCLES PER SECOND AND 5 MEGACYCLES PER SECOND UNDER CONDITIONS OF RESONANCE THEREBY INCREASING THE DEGREE OF AGITATION AND TURBULENCE TO PRODUCE CAVITATION AND TO PROVIDE FASTER QUENCHING OF THE SAID FERROUS METALS.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-08 | 1961-01-07 | 1961-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-08 | 1965-01-07 | 1965-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-08 | 1969-01-07 | 1969-07-09 | $7700.00 | Window Closed / Lapsed |