H.A. WHITTEN & COMPANY

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
C07D HETEROCYCLIC COMPOUNDS 1161
 
  
 
G03C PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES 145

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
5070007 Color photographic materials comprising phenolic thiane derivatives as light and thermal oxidation stabilizersFeb 06, 91Dec 03, 91[C07D, G03C]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5059515 Stabilizers for color photographic recording materialsExpiredSep 28, 90Oct 22, 91[G03C]
5006665 Phenolic thiane derivativesExpiredSep 29, 88Apr 09, 91[C07D]
4990249 Apparatus for the desludging of bathsExpiredFeb 27, 90Feb 05, 91[B01D]
4973506 Composite plate for the facing of building surfacesExpiredOct 27, 88Nov 27, 90[B32B]
4933271 Stabilizers for color photography recording materialsExpiredSep 29, 88Jun 12, 90[G03C]
4904815 Phenols and their productionExpiredOct 13, 87Feb 27, 90[C07C]
4799722 Apparatus for transporting perforated objectsExpiredNov 10, 87Jan 24, 89[B25J, B66C]
4791155 Assembly for monitoring ionising radiationExpiredJul 22, 87Dec 13, 88[G01T, C08L]
4744959 Apparatus for producing a suspension of cyanuric chloride in water, or for reacting cyanuric chloride with ammonia or with aminesExpiredNov 21, 86May 17, 88[C07D, B01F]
4743683 Imidazole azo dyesExpiredDec 03, 86May 10, 88[C07C, C09B]
4732997 Dibenzoxaphosphorin compoundsExpiredNov 18, 86Mar 22, 88[C07F]
4678852 Process for reacting cyanuric chloride with ammonia or with aminesExpiredOct 30, 84Jul 07, 87[C07D]
4661437 Photographic material with heterocylic azo dye for the silver dye bleach processExpiredJul 19, 85Apr 28, 87[G03C]
4661440 Process for stabilizing photographic material containing magenta couplerExpiredNov 07, 85Apr 28, 87[G03C]
4661601 Resorcinol compoundsExpiredApr 03, 85Apr 28, 87[C07C]
4655970 Process for the manufacture of anthraquinone compoundsExpiredSep 19, 84Apr 07, 87[C07C]
4645626 Process for the production of quinizarine derivatives which are disubstituted in the 5- and 8-positions by hydroxyl or chlorineExpiredAug 14, 85Feb 24, 87[C07C]
4629682 Recording material for color photographyExpiredMar 28, 85Dec 16, 86[G03C]
4626497 Process for the production of colored photographic polymer imagesExpiredMay 24, 85Dec 02, 86[G03C]
4608435 Benzo-1,4-quinonesExpiredApr 28, 83Aug 26, 86[C07D, C07C]

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