US3822138A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low shrinkage wax composition for investment casting
Assignee: Kureha Corp
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Filing: 1972-09-18
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Granted: 1974-07-02
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Expires: 1992-09-18
Abstract
Abstract A NOVEL WAX COMPOSITION FOR USE IN INVESTMENT CASTING BY THE "LOST WAX" PROCESS. THE NOVEL WAX COMPSITION CONTAINS HOLLOW ARBON MICROSPHERES AND A CONVERNTIONAL MOLDING WAX. IT MAY ADDITIONALLY CONTAIN A ROSIN AND/OR AN AMIDE. THE COMPOSITION IS CHARACTERIZED BY LOW SHRINKAGE, EXHIBITING ONLY A SMALLY VOLUME CHANGE IN TRANSITION BETWEEN THE SOLID STATE AND LIQUID STATE.
Inventors
- 👤 S Inada
- 👤 K Noguchi
- 👤 Y Ueda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:29
CPC Classifications
B; B22; B22C; B22C7/00; B22C7/02; C; C08; C08K; C08K7/00; C08K7/22; C08K7/24; C10; C10G; C10G73/00; C10G73/40
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) | 1977-07-01 | 1977-12-31 | 1978-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-01 | 1981-12-31 | 1982-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-01 | 1985-12-31 | 1986-07-02 | $7700.00 | Window Closed / Lapsed |