Use of menhaden oil to deflocculate dry ground alumina in manufacture of substrates
Abstract
Abstract DRY GROUND ALUMINA IS BALL MILLED WITH AN AZEOTROPIC SOLVENT MIXTURE, A GRAIN GROWTH INHIBITOR, AND PERIODIC ADDITIONS OF MENHADEN OIL UNTIL THE SURFACE AREA OF THE ALUMINA IS INCREASED TO 12 TO 15 M.**2/GM. THIS MATERIAL IS THEN MIXED WITH ADDITIONAL SOLVENT, POLYVINYL BUTYRAL AND A PLASTICIZER MIXTURE TO FORM A SLIP. THE SLIP IS DE-AIRED AND FORMED INTO A THIN FILM ON A MOVING SUPPORT TAPE WITH DOCTOR BLADE. AFTER DRYING THE FILM IS REMOVED AND FORMED INTO SUBSTRATES OF THE DESIRED SHAPE. THE SUBSTRATES ARE SUPPORTED ON A FLAT SURFACE AND COVERED WITH A FLAT BODY OF SUFFICIENT WEIGHT TO PREVENT WARPING DURING FIRING. THE SURFACE FINISH OF THE FIRED SUBSTRATES IS LESS THAN 3.5 IN.
Inventors
- 👤 H Stetson
- 👤 W Gyurk
Bibliographic Details
Claims Analysis
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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) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |