Assignee
PENNZOIL CO
39 granted patents·796 citations·filing 1971–1987
Top patents by PatentIndex Score
39 records- 0190US4501825ATire sealer and inflatorPENNZOIL CO·Filed 1984·Granted Feb 26, 1985·91 cites·20 claims
- 0290US4045543AProduction of potassium sulfate and hydrogen chloridePENNZOIL CO·Filed 1975·Granted Aug 30, 1977·36 cites·6 claims
- 0386USD289376SBottle or similar articlePENNZOIL CO·Filed 1984·Granted Apr 21, 1987·48 cites·1 claims
- 0486US4613446AGelled detergent composition and cleaning pads containing samePENNZOIL CO·Filed 1985·Granted Sep 23, 1986·62 cites·14 claims
- 0585US3998935AManufacture of potassium sulfatePENNZOIL CO·Filed 1975·Granted Dec 21, 1976·32 cites·12 claims
- 0684US4268492AProcess for production of potassium sulfate and hydrochloric acidPENNZOIL CO·Filed 1979·Granted May 19, 1981·24 cites·12 claims
- 0782US3956464APreparation of phosphatesPENNZOIL CO·Filed 1971·Granted May 11, 1976·28 cites·24 claims
- 0880US4303610ATest kit for field analysis of plant tissue magnesium and calciumPENNZOIL CO·Filed 1980·Granted Dec 1, 1981·52 cites·13 claims
- 0979US4670500ASurface coating compositionPENNZOIL CO·Filed 1985·Granted Jun 2, 1987·31 cites·10 claims
- 1076US4672545AMethod and apparatus for synthesizing three dimensional seismic dataPENNZOIL CO·Filed 1984·Granted Jun 9, 1987·40 cites·34 claims
- 1173US4371512AProduction of alkali metal sulfatesPENNZOIL CO·Filed 1981·Granted Feb 1, 1983·20 cites·12 claims
- 1272US4055626AMethod of producing fluoride-free phosphoric acidPENNZOIL CO·Filed 1976·Granted Oct 25, 1977·14 cites·7 claims
- 1371US4435370APreparation of monocalcium phosphate and/or phosphoric acid from phosphate rockPENNZOIL CO·Filed 1981·Granted Mar 6, 1984·19 cites·10 claims
- 1470US4284173AMotor vehicle lubricating facilityPENNZOIL CO·Filed 1979·Granted Aug 18, 1981·31 cites·7 claims
- 1569US4670171ASurface cleaner compositionPENNZOIL CO·Filed 1985·Granted Jun 2, 1987·35 cites·12 claims
- 1668US4222990AProduction of fluoride-free phosphatesPENNZOIL CO·Filed 1979·Granted Sep 16, 1980·14 cites·12 claims
- 1765US4158558APotassium polyphosphate fertilizersPENNZOIL CO·Filed 1978·Granted Jun 19, 1979·13 cites·21 claims
- 1864US4393032AProduction of phosphoric acid and additional products from phosphate orePENNZOIL CO·Filed 1982·Granted Jul 12, 1983·15 cites·55 claims
- 1961US4191734AFluoride-free phosphate reactionsPENNZOIL CO·Filed 1978·Granted Mar 4, 1980·11 cites·5 claims
- 2059US4866659AMethod for selection of mining and drilling sites using synthesized three dimensional seismic dataPENNZOIL CO·Filed 1987·Granted Sep 12, 1989·27 cites·19 claims
- 2158US4086322AProduction of fluoride-free phosphatesPENNZOIL CO·Filed 1975·Granted Apr 25, 1978·8 cites·12 claims
- 2258US4060586ARecovery of fluorides from gypsumPENNZOIL CO·Filed 1976·Granted Nov 29, 1977·10 cites·8 claims
- 2356US4648263ASupport and centering attachments for sensitive viscometersPENNZOIL CO·Filed 1985·Granted Mar 10, 1987·18 cites·16 claims
- 2454US4397425AGrinding apparatusPENNZOIL CO·Filed 1980·Granted Aug 9, 1983·13 cites·4 claims
- 2554US4160657APreparation of monocalcium phosphate and phosphoric acidPENNZOIL CO·Filed 1978·Granted Jul 10, 1979·12 cites·15 claims
- 2653US4393030AUpgrading of phosphate orePENNZOIL CO·Filed 1982·Granted Jul 12, 1983·8 cites·2 claims
- 2753US4328196AProduction of alkali metal products from alkali metal fluosilicatePENNZOIL CO·Filed 1980·Granted May 4, 1982·7 cites·12 claims
- 2851US4049893AHydrogenated waxy olefin and process of making samePENNZOIL CO·Filed 1975·Granted Sep 20, 1977·12 cites·21 claims
- 2950US4137063AProduction of potassium polyphosphates from potassium silicofluoridesPENNZOIL CO·Filed 1977·Granted Jan 30, 1979·5 cites·11 claims
- 3047US4479923AProduction of phosphoric acid and additional products from phosphate orePENNZOIL CO·Filed 1983·Granted Oct 30, 1984·7 cites·31 claims
- 3147US4387167ASulfur-based adducts and compositionsPENNZOIL CO·Filed 1981·Granted Jun 7, 1983·10 cites·29 claims
- 3247US4055481ATwo-stage process for manufacture of white oilsPENNZOIL CO·Filed 1976·Granted Oct 25, 1977·8 cites·10 claims
- 3345US4623447ABreaking middle phase emulsionsPENNZOIL CO·Filed 1985·Granted Nov 18, 1986·12 cites·9 claims
- 3440US4609406ARust conversion coatingsPENNZOIL CO·Filed 1984·Granted Sep 2, 1986·8 cites·16 claims
- 3538US4105748AMethod of producing phosphoric acid and potassium dihydrogen phosphate from phosphate rock in the substantial absence of fluorine evolutionPENNZOIL CO·Filed 1977·Granted Aug 8, 1978·3 cites·7 claims
- 3635US4450069AMethod for upgrading diene-containing hydrocarbon mixturesPENNZOIL CO·Filed 1981·Granted May 22, 1984·5 cites·7 claims
- 3735US4302255ASulfur-based adduct and compositions containing the adductPENNZOIL CO·Filed 1980·Granted Nov 24, 1981·5 cites·32 claims
- 3832US4343781ADecomposition of 2KCl.CuCl to produce cuprous chloride and potassium chloridePENNZOIL CO·Filed 1981·Granted Aug 10, 1982·1 cites·13 claims
- 3917US3936392AAnti-caking of potassium bisulfate and resulting compositionsPENNZOIL CO·Filed 1974·Granted Feb 3, 1976·1 cites·8 claims
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Counts cover granted patents and pending applications in the PatentIndex corpus. How scoring works →