Inventor · disambiguated record
Douglas V. Keller, Jr.
Also filed as: KELLER DOUGLAS V · KELLER DOUGLAS V JR · KELLER JR DOUGLAS V · SMITH CLAY D
25 granted patents·3 pending applications·517 citations·filing 1975–2006
97Inventor score
Top patents by PatentIndex Score
28 records- 0193US4151003AViscosity modification of bituminous materialsOTISCA IND LTD·Filed 1976·Granted Apr 24, 1979·46 cites·11 claims
- 0290US4484928AMethods for processing coalOTISCA IND LTD·Filed 1982·Granted Nov 27, 1984·39 cites·26 claims
- 0389US4067616AMethods of and apparatus for mining and processing tar sands and the likeSTANDARD OIL CO·Filed 1976·Granted Jan 10, 1978·34 cites·4 claims
- 0485US4173530AMethods of and apparatus for cleaning coalOTISCA IND LTD·Filed 1975·Granted Nov 6, 1979·36 cites·60 claims
- 0581US4244699ATreating and cleaning coal methodsOTISCA IND LTD·Filed 1979·Granted Jan 13, 1981·26 cites·8 claims
- 0680US4265737AMethods and apparatus for transporting and processing solidsOTISCA IND LTD·Filed 1980·Granted May 5, 1981·32 cites·9 claims
- 0777US4249699ACoal recovery processes utilizing agglomeration and density differential separationsOTISCA IND LTD·Filed 1979·Granted Feb 10, 1981·25 cites·18 claims
- 0876US4248698ACoal recovery processOTISCA IND LTD·Filed 1979·Granted Feb 3, 1981·24 cites·14 claims
- 0974US4770766ATime-controlled processes for agglomerating coalOTISCA IND LTD·Filed 1986·Granted Sep 13, 1988·36 cites·70 claims
- 1074US4224039ACoal briquetting methodsOTISCA IND LTD·Filed 1979·Granted Sep 23, 1980·20 cites·9 claims
- 1174US4055480AMulti-phase separation methods and apparatusSTANDARD OIL CO·Filed 1976·Granted Oct 25, 1977·21 cites·29 claims
- 1268US5589631ALeak detection with non-toxic liquidsSPRING PATENTS CORP·Filed 1994·Granted Dec 31, 1996·37 cites·4 claims
- 1368US4252639ACoal beneficiation processesOTISCA IND LTD·Filed 1979·Granted Feb 24, 1981·18 cites·14 claims
- 1467US6072930AMethod of fabricating a cylindrical optical fiber containing a particulate optically active filmUNIV SYRACUSE·Filed 1998·Granted Jun 6, 2000·27 cites·11 claims
- 1567US4234232AMethods of and apparatus for mining and processing tar sands and the likeSTANDARD OIL CO·Filed 1978·Granted Nov 18, 1980·11 cites·5 claims
- 1664US4294695AMulti-phase separation methods and apparatusSTANDARD OIL CO·Filed 1977·Granted Oct 13, 1981·16 cites·11 claims
- 1762US4461625AMethods of cleaning coalOTISCA IND LTD·Filed 1980·Granted Jul 24, 1984·12 cites·11 claims
- 1862US4178231AMethod and apparatus for coal separation using fluorinated hydrocarbonsOTISCA IND LTD·Filed 1978·Granted Dec 11, 1979·14 cites·31 claims
- 1955US4447245AMethods of cleaning coalOTISCA IND LTD·Filed 1980·Granted May 8, 1984·10 cites·9 claims
- 2052US2005252248A1Method of fabricating a cylindrical optical fiber containing a light interactive filmUNIV SYRACUSE·Filed 2005·Application pending·0 cites
- 2151US4515602ACoal compositionsOTISCA LTD·Filed 1982·Granted May 7, 1985·10 cites·10 claims
- 2250US7324732B2Lithium niobate coated optical fiber apparatus and methodFANASYS LLC·Filed 2006·Granted Jan 29, 2008·1 cites·20 claims
- 2348US2006042323A1Method of fabricating a cylindrical optical fiber containing a light interactive filmUNIV SYRACUSE·Filed 2005·Application pending·0 cites
- 2445US4274946AAgglomeration type coal recovery processesOTISCA IND LTD·Filed 1979·Granted Jun 23, 1981·6 cites·12 claims
- 2543US4186887AProcesses for recovering coalOTISCA IND LTD·Filed 1978·Granted Feb 5, 1980·6 cites·12 claims
- 2643US2007206911A1Gold Metal Cylinder FiberFANASYS LLC·Filed 2006·Application pending·0 cites
- 2742US4178233AFluorinated hydrocarbons in coal mining and beneficiationOTISCA IND LTD·Filed 1978·Granted Dec 11, 1979·6 cites·34 claims
- 2836US4089340AViscosity modification of hydrocarbonaceous materialsOTISCA IND LTD·Filed 1976·Granted May 16, 1978·4 cites·6 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →