Patent US3592702A successfully refreshed from Google Patents.
US3592702A
Expired / Lapsed
US
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Method of case-hardening an arcuate member
Assignee: OILWELL Inc A CORP OF
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Filing: 1970-05-15
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Granted: 1971-07-13
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Expires: 1990-05-15
Abstract
Abstract AN IMPROVED METHOD OF SURFACE HARDENING AN ARCUATE MEMBER, SUCH AS A LARGE PITCH GEAR, HAVING A FIRST TOOTH AND A SECOND TOOTH, EACH TOOTH HAVING OPPOSED FLANKS AND A ROOT SECTION WHICH DEFINE A VALLEY. THE METHOD OF SURFACE HARDENING INCLUDES THE STEPS OF: (1) SUPPORTING THE ARCUATE MEMBER; (2) PREHEATING A MOVING AREA ON THE FLANKS AND ROOT SECTION; (3) HEATING THE MOVING HEATED AREA ABOVE THE HARDENING TEMPERATURE OF THE ARCUATE MEMBER WITHOUT BURNING OR MELTING THE ARCUATE MEMBER; AND (4) QUENCHING THE MOVING HEATED AREA TO CASE-HARDEN SUCH MOVING HEATED AREA.
Inventors
- 👤 Edward H Dehn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:59
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/32
Claims Analysis
Total Claims: 0
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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) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |