US3824113A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of coating preformed ceramic cores
Assignee: Sherwood Refractories Inc
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Filing: 1972-05-08
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Granted: 1974-07-16
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Expires: 1992-05-08
Abstract
Abstract THIS INVENTION RELATES TO A METHOD OF COATING PREFORMED CERAMIC CORES WITH A THIN LAYER OF A REFRACTORY OXIDE, SAID OXIDE SERVING AS A REACTION BARRIER BETWEEN THE CERAMIC CORE ANDMOLTEN METALS, CONTAINING REACTIVE ALLOYING ELEMENTS. MORE SPECIFICALLY, THIS INVENTION RELATES TO A METHOD OF FORMING A CONTINUOUS IN SITU COATING ON A CERAMIC CORE BY IMMERSING SAID CORE IN A MOLTEN METAL BATH CONSISTING OF A NON-REACTIVE BASE OF SOLVENT METAL SUCH AS NICKEL OR COBALT, AND AT LEAST ONE SOLUTE METAL WHOSE FREE ENRGY OF OXIDE FORMATION IS LESS THAN MINUS 160 KILLOCALORIES PER MOLE OF OXYGEN AT 1260* C., SUCH AS ALUMINUM, ZIRCONIUM OR HAFNIUM.
Inventors
- 👤 T Loxley
- 👤 H Wheaton
- 👤 J Webb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:51
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; B; B22; B22C; B22C3/00; C04B41/45; C04B41/50; C04B41/51; C04B41/80; C04B41/81; C04B41/85; C04B41/88; F; F01; F01D; F01D5/00; F01D5/12; F01D5/28; F01D5/284
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1977-07-15 | 1978-01-14 | 1978-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-15 | 1982-01-14 | 1982-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-15 | 1986-01-14 | 1986-07-16 | $7700.00 | Window Closed / Lapsed |