PARKER CHEMICAL COMPANY, A DE CORP.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5234509 Cold deformation process employing improved lubrication coatingExpiredJan 04, 91Aug 10, 93[C23C]
5039770 Treatment and after-treatment of metal with polyphenol compoundsExpiredDec 04, 87Aug 13, 91[C08F]
4970264 Treatment and after-treatment of metal with amine oxide-containing polyphenol compoundsExpiredDec 04, 87Nov 13, 90[C08F]
4963596 Treatment and after-treatment of metal with carbohydrate-modified polyphenol compoundsExpiredDec 04, 87Oct 16, 90[C08F]
4865653 Zinc phosphate coating processExpiredOct 30, 87Sep 12, 89[C23C]
4812175 Passivation process and copmposition for zinc-aluminum alloysExpiredJun 10, 87Mar 14, 89[C23C]
4726848 Chlorinated hydrocarbon protective and/or decorative coating stripping composition and methodExpiredNov 02, 84Feb 23, 88[C09D, C23G]
4722753 Alkaline resistant phosphate conversion coatingsExpiredJan 20, 87Feb 02, 88[C23C]
4713121 Alkaline resistant phosphate conversion coatingsExpiredJan 20, 87Dec 15, 87[C23C]
4681641 Alkaline resistant phosphate conversion coatingsExpiredMay 16, 85Jul 21, 87[C23C]
4612060 Process for controlling zinc phosphate treating solutionsExpiredFeb 25, 85Sep 16, 86[C23C]
4597806 Process for maintaining the zinc content in zinc phosphate bathsExpiredJul 02, 85Jul 01, 86[C23F]
4596607 Alkaline resistant manganese-nickel-zinc phosphate conversion coatings and method of applicationExpiredJul 01, 85Jun 24, 86[C23C]
4559087 Process for phosphating metalsExpiredApr 17, 84Dec 17, 85[C23F]
4539051 Process for producing phosphate coatingsExpiredJan 10, 85Sep 03, 85[C23C, C25D]
4536460 Photoconductive memberExpiredOct 28, 82Aug 20, 85[G03G]
4533639 Test method for phosphate coatingsExpiredJun 20, 84Aug 06, 85[G01N]
4532309 Water-based epoxy resins stable to hydrolysisExpiredNov 28, 80Jul 30, 85[C08F, C08L]
4517029 Process for the cold forming of iron and steelExpiredJun 03, 83May 14, 85[C23F]
4517028 Treatment of metal with derivative of poly-alkenylphenolExpiredMay 09, 83May 14, 85[C23C, C09K, C23F]

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