Patent US3390216A successfully refreshed from Google Patents.
US3390216A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum extrusion shaping of ceramic materials
Assignee: Mitsubishi Heavy Industries Ltd
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Filing: 1963-07-05
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Granted: 1968-06-25
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Expires: 1983-07-05
Abstract
No abstract record available.
Inventors
- 👤 Umeya Kaoru
- 👤 Watanabe Takaaki
- 👤 Kondo Yoshiaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:19
CPC Classifications
B; B28; B28B; B28B3/00; B28B3/20; B28B3/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
A METHOD OF EXTRUSION SHAPING A CERAMIC MATERIAL, COMPRISING THE STEPOS OF PRE-SHAPING A MASS OF CERAMIC MATERIAL BY PASSING IT THROUGH AT LEAST ONE AUGER EXTRUSION MACHINE, IMMEDIATELY VACUUM DEGASSIG IT AND BEFORE IT HAS TIME TO SET DUE TO WORK HARDENING, DIRECTLY PASSING IT THROUGH A PISTON-TYPE EXTRUSION PRESS FOR SHAPING IT WHILE MAINTAINING THE MATERIAL IN THE DEGASSED STATE.
Claim 2
Independent Claim
62 words
A METHOD OF EXTRUSION SHAPING A CERAMIC MATERIAL, COMPRISING THE STEPOS OF PRE-SHAPING A MASS OF CERAMIC MATERIAL BY PASSING IT THROUGH AT LEAST ONE AUGER EXTRUSION MACHINE, IMMEDIATELY VACUUM DEGASSIG IT AND BEFORE IT HAS TIME TO SET DUE TO WORK HARDENING, DIRECTLY PASSING IT THROUGH A PISTON-TYPE EXTRUSION PRESS FOR SHAPING IT WHILE MAINTAINING THE MATERIAL IN THE DEGASSED STATE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-06-25 | 1971-12-25 | 1972-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-25 | 1975-12-25 | 1976-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-25 | 1979-12-25 | 1980-06-25 | $7700.00 | Window Closed / Lapsed |