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US3619861A
Expired / Lapsed
US
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Die and punch sets
Assignee: ZF International UK Ltd
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Filing: 1969-01-21
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Granted: 1971-11-16
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Expires: 1989-01-21
Abstract
Abstract A DIE AND PUNCH SET FOR PRESSURE SINTERING REFRACTORY NON-METALLIC MATERIAL COMPRISING A HOLLOW DIE, A PUNCH INTENDED TO ENTER THE INTERIOR OF THE DIE TO COMPRESS POWDERED MATERIAL THEREIN, A PLUG AGAINST WHICH THE MATERIAL IS COMPRESSED BY THE PUNCH AND A SPACER BETWEEN THE PUNCH AND THE PORTION OF THE ASSOCIATED MACHINE (NOT SHOWN), BY MEANS OF WHICH PRESSURE IS APPLIED, THE SPACER BEING FORMED FROM SILICON NITRIDE.
Inventors
- 👤 Roland John Lumby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:30
CPC Classifications
B; B30; B30B; B30B15/00; B30B15/06; B30B15/061; B28; B28B; B28B3/00; B28B3/02; B28B3/025
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) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |