CHARLES J. SCHAFER

Patent Owner

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
E02B HYDRAULIC ENGINEERING 216
 
  
 
F16K VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING271

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
8403596 Groundwater control system and methodJun 30, 04Mar 26, 13[E02B]
8342775 Groundwater control system with purity sensor and methodMay 13, 05Jan 01, 13[E02B]
6786234 Drainage tile flow regulatorJan 16, 04Sep 07, 04[F16K]
6715508 Drainage tile flow regulatorJun 06, 02Apr 06, 04[F16K]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
6672626 Corrugated pipe connection stabilizing apparatusExpiredJul 23, 02Jan 06, 04[F16L]

Top Inventors for This Owner

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