Patent US3738830A successfully refreshed from Google Patents.
US3738830A
Expired / Lapsed
US
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Method for producing a metal die or mold
Assignee: Toyota Central R&D Labs Inc
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Filing: 1970-06-26
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Granted: 1973-06-12
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Expires: 1990-06-26
Abstract
Abstract A METHOD FOR PRODUCING A METAL DIE OR MOLD INCLUDING THE STEPS OF PLACING A PATTERN, CORRESPONDING IN CONFIGURATION TO THAT OF THE CAVITY SURFACE OF A DESIRED DIE, IN A FRAME, OR BOX, FILLING THE FRAME WITH A SINTERING POWDER SUCH AS IRON, COOPPER, IRON AD GRAPHITE, OR MIXTURES THEREOF, AND HEATING THE POWDER TOGETHER WITH THE PATTERN IN THE FRAME TO SINTERING TEMPERATURE, WHEREBY TO FORM A DIE COMPLEMENTING THE PATTERN IN THE CONFIGURATION.
Inventors
- 👤 T Kimura
- 👤 Y Abe
- 👤 H Hamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:55
CPC Classifications
B; B22; B22F; B22F5/00; B22F5/10; B22C; B22C9/00; B22C9/06; B22C9/061; B22F2005/103; B22F2998/00
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) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |