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Q. |
In which year was the Ferrosand process patented? |
A. | 1960 |
B. | 1965 |
C. | 1970 |
D. | 1975 |
Answer» B. 1965 | |
Explanation: the manganese greensand process has been used in the united states since the 1950s. during the early years of its use, hungerford & terry, inc. of clayton, new jersey, worked to improve the process and eventually developed the ferrosand® cr process, patented in 1965. |
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