NRC, Inc.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4957541 Capacitor grade tantalum powderExpiredNov 01, 88Sep 18, 90[B22F]
4859257 Fine grained embrittlement resistant tantalum wireExpiredOct 04, 88Aug 22, 89[C22C]
4483819 Production of highly capacitive agglomerated valve metal powder and valve metal electrodes for the production of electrolytic capacitorsExpiredJul 19, 82Nov 20, 84[B22F]
4235629 Method for producing an embrittlement-resistant tantalum wireExpiredOct 17, 77Nov 25, 80[B22F]

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