US3694264A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Core removal
Assignee: DONN K COLETTI
•
Filing: 1970-09-28
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Granted: 1972-09-26
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Expires: 1990-09-28
Abstract
Abstract CALCIA-BASED CORES IN METALLIC OBJECTS, SUCH AS CAST FLUID-COOLABLE TURBINE BLADES, ARE EFFICIENTLY REMOVED BY EXPOSING THE CORES TO THE ACTION OF AQUEOUS SOLUTIONS OF AMMONIUM SALTS. IT IS PARTICULARLY ADVANTAGEOUS TO USE A 5 MOLAR AQUEOUS SOLUTION OF AMMONIUM CHLORIDE.
Inventors
- 👤 Stuart L Weinland
- 👤 Donn K Coletti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:32
CPC Classifications
B; B22; B22D; B22D29/00; B22D29/001; B22D29/002; B22C; B22C9/00; B22C9/10; B22C9/105; F; F01; F01D; F01D5/00; F01D5/12; F01D5/14; F01D5/18; F01D5/187; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49316; Y10T29/49318
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) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |