FOX, ROBERT C.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4391703 Marine sewage treatment with biological filterExpiredApr 06, 82Jul 05, 83[C02F]
4337151 Method and apparatus for pulsed timed control for sludge return lineExpiredDec 29, 80Jun 29, 82[C01C]
4317723 Sewage treatmentExpiredMay 19, 80Mar 02, 82[C02F]
4268389 Sewage treatmentExpiredNov 16, 79May 19, 81[C02F]
4253957 Marine sewage disposalExpiredOct 09, 79Mar 03, 81[C02C]

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