MIDWEST DENTAL CORPORATION, A DE. CORP.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4600384 Swivel coupling for illuminated dental handpieceExpiredSep 28, 84Jul 15, 86[A61C]
4575338 Ball type bur gripping mechanism for dental handpieceExpiredNov 21, 84Mar 11, 86[A61C]
4568284 Dental handpieceExpiredOct 26, 84Feb 04, 86[A61C]
4553938 Low torsional restraint instrument handpiece hoseExpiredNov 10, 83Nov 19, 85[A61C]
4541802 Swivel hose coupling for dental handpiece or the likeExpiredDec 24, 84Sep 17, 85[A61C]
4536157 Lever actuated chuck mechanism for dental handpieceExpiredNov 21, 84Aug 20, 85[A61C]
4445858 Apparatus for photo-curing of dental restorative materialsExpiredFeb 19, 82May 01, 84[A61C]
D267974 Dental handpiece motorExpiredJun 23, 80Feb 15, 83[D240]
4340366 Water/air spray system for dental handpieceExpiredFeb 23, 81Jul 20, 82[A61C]
4330279 Fluid spray system for dental handpieceExpiredJan 07, 80May 18, 82[A61C]
4324548 Latch mechanism for dental handpiece assemblyExpiredJun 23, 80Apr 13, 82[A61C]
D263742 Dental handpiece wrenchExpiredJan 03, 80Apr 06, 82[D240]
4315744 Chuck wrench for dental handpiecesExpiredJan 03, 80Feb 16, 82[A61C]
4279597 Chuck assembly for dental handpiecesExpiredSep 12, 79Jul 21, 81[A61C]
4219330 Dental handpiece and rotor cartridge replacement assembly thereforExpiredSep 20, 78Aug 26, 80[A61C]
D256050 Dental handpieceExpiredMay 30, 78Jul 22, 80[D240]
D255930 Dental handpieceExpiredMay 30, 78Jul 15, 80[D240]

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