Dobson Park Industries Limited

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Patent Activity in the Last 10 Years

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4712934 Typewriter carriage escapement mechanism having two sets of teethExpiredNov 26, 85Dec 15, 87[B41J]
4692067 Control systemsExpiredJun 18, 84Sep 08, 87[E21D]
4643392 ValvesExpiredJan 14, 85Feb 17, 87[F16K, E21D, F01B]
4637816 Apparatus for the oral administration of capsules to animalsExpiredDec 12, 84Jan 20, 87[A61M]
4617954 Valve assembliesExpiredMar 13, 84Oct 21, 86[F15B]
4605341 Mine roof support and attachment means thereforExpiredOct 22, 84Aug 12, 86[E21D]
4586867 Connection devicesExpiredDec 27, 83May 06, 86[B25G, B66C]
4583709 ValvesExpiredJun 14, 84Apr 22, 86[F16K]
4580594 Valve devicesExpiredDec 17, 84Apr 08, 86[F16K]
4573518 Casting method and apparatusExpiredMay 08, 84Mar 04, 86[B22D]
D282185 Combined printing toy and case thereforeExpiredJul 16, 82Jan 14, 86[]
4563111 Mine roof supportsExpiredMar 05, 84Jan 07, 86[E21D]
4560306 Coal face supportExpiredApr 05, 83Dec 24, 85[E21D]
4505517 Self-advancing mine roof supportsExpiredOct 22, 82Mar 19, 85[E21D]
4490076 Underground support devicesExpiredSep 24, 82Dec 25, 84[E21D]
D271596 Combined toy typewriter and loudspeaker thereforExpiredMay 21, 81Nov 29, 83[D210]
D270849 Combined toy sewing machine and case thereforExpiredMay 21, 81Oct 04, 83[D210]
4395147 Daisy wheel printerExpiredJul 02, 81Jul 26, 83[B41J]
4385847 Daisy wheel printerExpiredJul 02, 81May 31, 83[B41J]
D268122 Toy typewriter with integral platformExpiredMay 28, 80Mar 01, 83[D210]

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