Patent US3362854A successfully refreshed from Google Patents.
US3362854A
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Surface hardening treatment of steel or alloy steel by means of supersonic wave
Assignee: NOBUTSUGU UTAGAWA
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Filing: 1964-02-04
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Granted: 1968-01-09
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Expires: 1984-02-04
Abstract
No abstract record available.
Inventors
- 👤 Tanabe Toshimitsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:41
CPC Classifications
C; C23; C23C; C23C10/00; C23C10/18; C23C10/20; C23C10/24; C23C8/00; C23C8/40; C23C8/42; C23C8/44; C23C8/46; C23C8/48; C23C8/50; C23C8/52; C23C8/54
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
THE METHOD OF SURFACE HARDENING AN ARTICLE OF STEEL OR ALLOY STEEL, COMPRISING, IMMERSING SAID ARTICLE IN A MOLTEN SALT BATH CONTAINING METALLIC POWDER CAPABLE OF LIBERATING CARBON AND NITROGEN AND HEATED TO FROM ABOUT 450*C. UP TO BELOW THE MELTING POINT OFSAID ARTICLE, WHILE IMPARTING SUPERSONIC VIBRATIONS TO SAID ARTICLE.
Claim 2
Independent Claim
51 words
THE METHOD OF SURFACE HARDENING AN ARTICLE OF STEEL OR ALLOY STEEL, COMPRISING, IMMERSING SAID ARTICLE IN A MOLTEN SALT BATH CONTAINING METALLIC POWDER CAPABLE OF LIBERATING CARBON AND NITROGEN AND HEATED TO FROM ABOUT 450*C. UP TO BELOW THE MELTING POINT OFSAID ARTICLE, WHILE IMPARTING SUPERSONIC VIBRATIONS TO SAID ARTICLE.
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) | 1971-01-08 | 1971-07-10 | 1972-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-01-08 | 1975-07-10 | 1976-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-01-08 | 1979-07-10 | 1980-01-09 | $7700.00 | Window Closed / Lapsed |