Assignee
PARK OHIO INDUSTRIES INC
US·51 granted patents·954 citations·filing 1974–1997
Top patents by PatentIndex Score
51 records- 0188US4401485AMethod for inductively heating thin-walled elongated workpiecesPARK OHIO INDUSTRIES INC·Filed 1981·Granted Aug 30, 1983·27 cites·7 claims
- 0288US4258241ASlot furnace for inductively heating axially spaced areas of a workpiecePARK OHIO INDUSTRIES INC·Filed 1979·Granted Mar 24, 1981·62 cites·8 claims
- 0385US4370703ASolid state frequency converterPARK OHIO INDUSTRIES INC·Filed 1981·Granted Jan 25, 1983·46 cites·12 claims
- 0484US4114010ATest circuit and method for matching an induction load to a solid state power supplyPARK OHIO INDUSTRIES INC·Filed 1977·Granted Sep 12, 1978·32 cites·9 claims
- 0583US4577081AHeating nonmagnetic metal workpiecesPARK OHIO INDUSTRIES INC·Filed 1984·Granted Mar 18, 1986·21 cites·11 claims
- 0683US4122321AInduction heating furnacePARK OHIO INDUSTRIES INC·Filed 1977·Granted Oct 24, 1978·44 cites·2 claims
- 0783US4039794AApparatus and method for heating ferromagnetic abrasive shotPARK OHIO INDUSTRIES INC·Filed 1976·Granted Aug 2, 1977·45 cites·15 claims
- 0881US3935416AInductor-workpiece position detectorPARK OHIO INDUSTRIES INC·Filed 1974·Granted Jan 27, 1976·26 cites·16 claims
- 0980US4475839ASucker rod fittingPARK OHIO INDUSTRIES INC·Filed 1983·Granted Oct 9, 1984·57 cites·11 claims
- 1078US4625090AApparatus for inductively heat treating workpiece bore wallsPARK OHIO INDUSTRIES INC·Filed 1985·Granted Nov 25, 1986·16 cites·20 claims
- 1178US4531987AMethod for inductively heat treating workpiece bore wallsPARK OHIO INDUSTRIES INC·Filed 1984·Granted Jul 30, 1985·18 cites·11 claims
- 1276US4511956APower inverter using separate starting inverterPARK OHIO INDUSTRIES INC·Filed 1981·Granted Apr 16, 1985·27 cites·41 claims
- 1376US4420667AInduction heating method and apparatus for elongated workpiecesPARK OHIO INDUSTRIES INC·Filed 1982·Granted Dec 13, 1983·29 cites·5 claims
- 1476US4184798AWorkpiece rotating and feeding apparatusPARK OHIO INDUSTRIES INC·Filed 1978·Granted Jan 22, 1980·18 cites·8 claims
- 1575USD359406STable with removable tray and/or insertPARK OHIO INDUSTRIES INC·Filed 1993·Granted Jun 20, 1995·21 cites·1 claims
- 1675US4438310AMethod and apparatus for inductively heating valve seat insertsPARK OHIO INDUSTRIES INC·Filed 1983·Granted Mar 20, 1984·24 cites·8 claims
- 1775US4418259AMethod and apparatus of uniform induction heating of an elongated workpiecePARK OHIO INDUSTRIES INC·Filed 1981·Granted Nov 29, 1983·16 cites·16 claims
- 1874US4090698AMethod and apparatus of inductively heating elongated workpiecesPARK OHIO INDUSTRIES INC·Filed 1977·Granted May 23, 1978·20 cites·3 claims
- 1974US3944446AMethod of inductively heating and quench hardening camshaftsPARK OHIO INDUSTRIES INC·Filed 1975·Granted Mar 16, 1976·26 cites·4 claims
- 2073US4251704AUnit for induction heating and hardening gear teethPARK OHIO INDUSTRIES INC·Filed 1979·Granted Feb 17, 1981·27 cites·8 claims
- 2172US4619717AHeating magnetic metal workpiecesPARK OHIO INDUSTRIES INC·Filed 1984·Granted Oct 28, 1986·15 cites·8 claims
- 2270US4482793AApparatus for simultaneously heating a plurality of elongated workpiecesPARK OHIO INDUSTRIES INC·Filed 1982·Granted Nov 13, 1984·13 cites·23 claims
- 2369US4501942AMethod and apparatus for uniform induction heating of an elongated workpiecePARK OHIO INDUSTRIES INC·Filed 1982·Granted Feb 26, 1985·13 cites·16 claims
- 2467US3986710AQuench unit for inductively heated workpiecesPARK OHIO INDUSTRIES INC·Filed 1975·Granted Oct 19, 1976·13 cites·3 claims
- 2566US4468010AMethod and apparatus for quench hardening thin-walled, elongated workpiecesPARK OHIO INDUSTRIES INC·Filed 1983·Granted Aug 28, 1984·12 cites·3 claims
- 2664US4531036AApparatus and method for inductively hardening small boresPARK OHIO INDUSTRIES INC·Filed 1984·Granted Jul 23, 1985·13 cites·9 claims
- 2761US5564345AStackable table, table assembly, and tray and table combinationPARK OHIO INDUSTRIES INC·Filed 1993·Granted Oct 15, 1996·26 cites·20 claims
- 2861US4537102AMethod of shearing metal billetsPARK OHIO INDUSTRIES INC·Filed 1983·Granted Aug 27, 1985·17 cites·10 claims
- 2961US4336924AApparatus for quenching heated workpiecesPARK OHIO INDUSTRIES INC·Filed 1980·Granted Jun 29, 1982·11 cites·7 claims
- 3060US4468549AInduction heater arrangement for forging bar stockPARK OHIO INDUSTRIES INC·Filed 1982·Granted Aug 28, 1984·26 cites·25 claims
- 3156US4401486AMethod for annealing work hardened portions of structural beamsPARK OHIO INDUSTRIES INC·Filed 1981·Granted Aug 30, 1983·13 cites·15 claims
- 3256US4123644ADevice for inductively heating cylindrical surfacesPARK OHIO INDUSTRIES INC·Filed 1977·Granted Oct 31, 1978·13 cites·14 claims
- 3355US4251707AInductor for axially and circumferentially heating a rotating workpiecePARK OHIO INDUSTRIES INC·Filed 1979·Granted Feb 17, 1981·16 cites·16 claims
- 3454US4385348AInverter with improved power factor controlPARK OHIO INDUSTRIES INC·Filed 1981·Granted May 24, 1983·12 cites·12 claims
- 3551US4307278AControl device for parallel induction heating coilsPARK OHIO INDUSTRIES INC·Filed 1980·Granted Dec 22, 1981·11 cites·7 claims
- 3650US4482879ATransformer core cooling arrangementPARK OHIO INDUSTRIES INC·Filed 1983·Granted Nov 13, 1984·13 cites·44 claims
- 3745US4419149AMethod for quenching heated workpiecesPARK OHIO INDUSTRIES INC·Filed 1981·Granted Dec 6, 1983·6 cites·3 claims
- 3845US4317978AInduction heater arrangement for forging bar stockPARK OHIO INDUSTRIES INC·Filed 1980·Granted Mar 2, 1982·15 cites·22 claims
- 3945US4251705AInductor for hardening gear teethPARK OHIO INDUSTRIES INC·Filed 1979·Granted Feb 17, 1981·8 cites·3 claims
- 4044US4433226AMethod and apparatus for induction heating of an elongated workpiecePARK OHIO INDUSTRIES INC·Filed 1981·Granted Feb 21, 1984·15 cites·2 claims
- 4143US3970813AApparatus for inductively heating the end of an elongated workpiecePARK OHIO INDUSTRIES INC·Filed 1975·Granted Jul 20, 1976·8 cites·9 claims
- 4242US3988179AMethod and apparatus for inductively heating elongated workpiecesPARK OHIO INDUSTRIES INC·Filed 1975·Granted Oct 26, 1976·10 cites·26 claims
- 4336US4507722AMethod and apparatus for controlling the power factor of a resonant inverterPARK OHIO INDUSTRIES INC·Filed 1984·Granted Mar 26, 1985·4 cites·4 claims
- 4436US4086464AResistance heating device with improved workpiece feeding mechanismPARK OHIO INDUSTRIES INC·Filed 1976·Granted Apr 25, 1978·3 cites·14 claims
- 4535US6238787B1Method of attaching a strip to a rubber molded partPARK OHIO INDUSTRIES INC·Filed 1997·Granted May 29, 2001·12 cites·30 claims
- 4634US4266109AFloating valve seat inductorPARK OHIO INDUSTRIES INC·Filed 1980·Granted May 5, 1981·6 cites·13 claims
- 4734US4191363AQuenching device for inductively heated workpiecesPARK OHIO INDUSTRIES INC·Filed 1978·Granted Mar 4, 1980·5 cites·12 claims
- 4834US4006337AApparatus and method for heating a gun barrel borePARK OHIO INDUSTRIES INC·Filed 1976·Granted Feb 1, 1977·7 cites·13 claims
- 4932US4538041ARotating induction heating apparatusPARK OHIO INDUSTRIES INC·Filed 1983·Granted Aug 27, 1985·9 cites·26 claims
- 5025US4195213AFeeding mechanism for induction heating coilPARK OHIO INDUSTRIES INC·Filed 1978·Granted Mar 25, 1980·6 cites·21 claims
Showing the top 50 of 51 patent records by PatentIndex Score.
Join the waitlist — get patent alerts
Get an alert when PARK OHIO INDUSTRIES INC files or is granted a new patent.
We store only your email — no account needed. See our privacy policy.
Counts cover granted patents and pending applications in the PatentIndex corpus. How scoring works →