Assignee
VIRGINIA CHEMICALS INC
29 granted patents·615 citations·filing 1973–1987
Top patents by PatentIndex Score
29 records- 0196US4187695AAir-conditioning system having recirculating and flow-control meansVIRGINIA CHEMICALS INC·Filed 1978·Granted Feb 12, 1980·101 cites·12 claims
- 0289US3955375ACombination liquid trapping suction accumulator and evaporator pressure regulator device including a capillary cartridge and heat exchangerVIRGINIA CHEMICALS INC·Filed 1974·Granted May 11, 1976·46 cites·3 claims
- 0385US4354362AIntegral suction line accumulator/filter-drierVIRGINIA CHEMICALS INC·Filed 1980·Granted Oct 19, 1982·59 cites·34 claims
- 0484US4177145ATwo-way filter-drier for heat pump systemsVIRGINIA CHEMICALS INC·Filed 1978·Granted Dec 4, 1979·41 cites·21 claims
- 0583US4364756ARefrigerant suction line filter/filter-drier and method for the construction thereofVIRGINIA CHEMICALS INC·Filed 1981·Granted Dec 21, 1982·48 cites·17 claims
- 0682US3985674AStabilized sodium dithionite solutionsVIRGINIA CHEMICALS INC·Filed 1974·Granted Oct 12, 1976·27 cites·15 claims
- 0781US4503262AProcess for the production of 2,6-diisopropylnaphthalene dihydroperoxideVIRGINIA CHEMICALS INC·Filed 1983·Granted Mar 5, 1985·20 cites·7 claims
- 0876US4288402AAcid field test kit for refrigeration oils containing a leak detectorVIRGINIA CHEMICALS INC·Filed 1979·Granted Sep 8, 1981·30 cites·29 claims
- 0975US4612389ATreatment of waste stream from pentaerythritol manufactureVIRGINIA CHEMICALS INC·Filed 1982·Granted Sep 16, 1986·13 cites·6 claims
- 1075US4534954ASodium hydrosulfite slurriesVIRGINIA CHEMICALS INC·Filed 1984·Granted Aug 13, 1985·24 cites·2 claims
- 1175US4277620AByproduct recovery from a pentaerythritol waste streamVIRGINIA CHEMICALS INC·Filed 1980·Granted Jul 7, 1981·17 cites·11 claims
- 1271US3961034AMethod of removing sodium thiosulfate from a hydrosulfite reaction mixtureVIRGINIA CHEMICALS INC·Filed 1974·Granted Jun 1, 1976·18 cites·4 claims
- 1371US3957253AApparatus for aqueous solutions of pure sodium hydrosulfiteVIRGINIA CHEMICALS INC·Filed 1973·Granted May 18, 1976·18 cites·7 claims
- 1470US4283303AProcess for manufacture of stable sodium dithionite slurriesVIRGINIA CHEMICALS INC·Filed 1980·Granted Aug 11, 1981·19 cites·9 claims
- 1570US4140436APressure control device for fluid systemsVIRGINIA CHEMICALS INC·Filed 1977·Granted Feb 20, 1979·22 cites·29 claims
- 1662US3938353ALiquid trapping suction accumulatorVIRGINIA CHEMICALS INC·Filed 1974·Granted Feb 17, 1976·21 cites·4 claims
- 1761US4095742ABalanced single port thermostatic expansion valveVIRGINIA CHEMICALS INC·Filed 1976·Granted Jun 20, 1978·20 cites·19 claims
- 1858US4328366ATreatment of waste stream from pentaerythritol productionVIRGINIA CHEMICALS INC·Filed 1980·Granted May 4, 1982·6 cites·31 claims
- 1953US3942332ACombination liquid trapping suction accumulator and evaporator pressure regulator deviceVIRGINIA CHEMICALS INC·Filed 1974·Granted Mar 9, 1976·11 cites·4 claims
- 2050US3939669ACombination liquid trapping suction accumulator and evaporator pressure regulator device including a drier and thermostatic expansion valveVIRGINIA CHEMICALS INC·Filed 1974·Granted Feb 24, 1976·10 cites·2 claims
- 2150US3938351ACombination liquid trapping suction accumulator and evaporator pressure regulator device including a cartridge type expansion valveVIRGINIA CHEMICALS INC·Filed 1974·Granted Feb 17, 1976·10 cites·3 claims
- 2245US4310338AReplaceable float oil separatorVIRGINIA CHEMICALS INC·Filed 1980·Granted Jan 12, 1982·14 cites·22 claims
- 2338US4729886AMethod of preparing reproducibly stable aqueous suspensions of sodium dithionite for woodpulp bleachingVIRGINIA CHEMICALS INC·Filed 1986·Granted Mar 8, 1988·6 cites·9 claims
- 2437US4569797AProduction of isoxanthate salts and dithiocarbonate diestersVIRGINIA CHEMICALS INC·Filed 1983·Granted Feb 11, 1986·1 cites·15 claims
- 2535US4423618ARehardening of copper connectorsVIRGINIA CHEMICALS INC·Filed 1981·Granted Jan 3, 1984·3 cites·7 claims
- 2633US4127642AProduction of sodium dithionite from sulfur dioxide, sodium formate, and sodium carbonate with minimum quantities of water and methanolVIRGINIA CHEMICALS INC·Filed 1978·Granted Nov 28, 1978·4 cites·16 claims
- 2731US4863564AMethod of bleaching high yield pulp by using dithionite ion and excluding oxygenVIRGINIA CHEMICALS INC·Filed 1987·Granted Sep 5, 1989·2 cites·6 claims
- 2827US4218429AProduction of alkali metal dithionites from sulfur dioxide, alkali metal formates, and slurried bisulfite compounds at high reactant concentrationsVIRGINIA CHEMICALS INC·Filed 1978·Granted Aug 19, 1980·1 cites·14 claims
- 2926US4622216ATreatment of sodium dithionite reaction mixtureVIRGINIA CHEMICALS INC·Filed 1985·Granted Nov 11, 1986·3 cites·7 claims
Join the waitlist — get patent alerts
Get an alert when VIRGINIA CHEMICALS 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 →