US3806380A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for hardening treatment of aluminum or aluminum-base alloy
Assignee: Hitachi Ltd
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Filing: 1972-03-06
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Granted: 1974-04-23
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Expires: 1992-03-06
Abstract
Abstract ON IMPLATATION OF POSITIVE IONS WITH THE CONCENTRATION OF ABOUT 10**14-10**16 /CM.2 COMPRISED OF AT LEAST ONE OF THE POSITIVE IONS B+, NE+. N+, P+, O+ OR AR+ INTO A PURE ALUMINUM FILM HAVING A KNOOP HARDNESS OF ABOUT 12, UNDER THE IMPLATATION ENERGY ON ORDER OF 45 KEY., THE SURFACE LAYER EXISTING IN THE DEPTH OF SEVERAL THOUSANDS A. FROM THE TREATED SURFACE OF THE ALUMINUM FILM EXHIBITS A KNOOP HARDNESS OF HK=16 TO 18 BY MEANS OF RADIATION DAMAGE. FURTHER, ON APPLYING HEAT TREATMENT WITH TEMPERATURES OF ABOUT 50 TO ABOUT 450*C. TO THE ABOVEMENTIONED INO-IMPLANTED PART, THE SURFACE HARDNESS OF THIS PART IS INCREASED.
Inventors
- 👤 G Kamoshita
- 👤 M Kitada
- 👤 T Tsuchimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:55
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/22; C23C14/48
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) | 1977-04-22 | 1977-10-22 | 1978-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-22 | 1981-10-22 | 1982-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-22 | 1985-10-22 | 1986-04-23 | $7700.00 | Window Closed / Lapsed |