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Ferro Engineering Co
Ferro Engi
Active Patents
0
Total Holdings
2
Patent Holdings
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Patent No.
Title
Status
Filing Date
Grant Date
Claims
Actions
US2390500A
Low volume sinkhead
Expired / Lapsed
1942-07-30
1945-12-11
0
Details
US2341589A
Hot top
Expired / Lapsed
1942-07-30
1944-02-15
0
Details