Inventor · disambiguated record
Donald K. Hagar
Also filed as: HAGAR DONALD K
17 granted patents·1 pending application·281 citations·filing 1975–2003
94Inventor score
Top patents by PatentIndex Score
18 records- 0181US4791980ASealing arrangement for air preheaterEAGLEAIR INC·Filed 1987·Granted Dec 20, 1988·47 cites·16 claims
- 0278US4927351AMethod and system for controlling the supply of fuel and air to a furnaceEAGLEAIR INC·Filed 1989·Granted May 22, 1990·37 cites·4 claims
- 0376US4673026ASealing arrangement for air preheaterEAGLEAIR INC·Filed 1984·Granted Jun 16, 1987·40 cites·17 claims
- 0465US4504216ABurner register assemblyEAGLEAIR INC·Filed 1982·Granted Mar 12, 1985·21 cites·2 claims
- 0564US4887958AMethod and system for controlling the supply of fuel and air to a furnaceHAGAR DONALD K·Filed 1986·Granted Dec 19, 1989·24 cites·29 claims
- 0653US4191212AMultiple blade damper assemblyDAMPER DESIGN INC·Filed 1977·Granted Mar 4, 1980·13 cites·19 claims
- 0751US4334550ASealing means for sliding gate valveMOSSER IND·Filed 1975·Granted Jun 15, 1982·13 cites·13 claims
- 0849US4088146AApparatus and method for sealing dampersHAGAR DONALD K·Filed 1976·Granted May 9, 1978·10 cites·28 claims
- 0947US5363903APerimeter seal for air heaterDAMPER DESIGN INC·Filed 1993·Granted Nov 15, 1994·16 cites·7 claims
- 1044US3972348ATemperature compensating valve assemblyMOSSER IND·Filed 1975·Granted Aug 3, 1976·8 cites·6 claims
- 1142US4273365AExpansion joint and fabric thereforHAGAR DONALD K·Filed 1979·Granted Jun 16, 1981·11 cites·30 claims
- 1240US5302115ABurner register assemblyDAMPER DESIGN INC·Filed 1992·Granted Apr 12, 1994·11 cites·15 claims
- 1339US4801261AApparatus and method for delivery of combustion air in multiple zonesEAGLEAIR INC·Filed 1987·Granted Jan 31, 1989·7 cites·19 claims
- 1438US5038849ASealing of air heaters by deforming sector platesDAMPER DESIGN INC·Filed 1989·Granted Aug 13, 1991·9 cites·11 claims
- 1538US2005022887A1Flow diverter arrangementDAMPER DESIGN INC·Filed 2003·Application pending·0 cites
- 1635US5427314AApparatus and method for delivery of particulate fuel and transport airDAMPER DESIGN INC·Filed 1994·Granted Jun 27, 1995·7 cites·22 claims
- 1735US5211705AApparatus and method for delivery of combustion air in multiple zonesDAMPER DESIGN INC·Filed 1990·Granted May 18, 1993·6 cites·2 claims
- 1828US4235460AExpansion jointHAGAR DONALD K·Filed 1978·Granted Nov 25, 1980·1 cites·10 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →