Koh-I-Noor Rapidograph, Inc.

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Patent Activity in the Last 10 Years

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5052841 Stylo pen tipExpiredMay 18, 90Oct 01, 91[B43K]
5004365 Drop-weight and tubular writing instrumentExpiredMay 04, 90Apr 02, 91[B43K]
5000606 Drop-weight and tubular writing instrumentExpiredMay 04, 89Mar 19, 91[B43K]
4945121 Thermosetting dyed latex colorant dispersionsExpiredAug 18, 87Jul 31, 90[C08L, C08K]
4930921 Tubular writting pen with superposed pressure equalization chambersExpiredDec 22, 88Jun 05, 90[B43K]
4913283 Case for drawing boardsExpiredMar 30, 88Apr 03, 90[A45C]
4900176 Pivotable pen tipExpiredAug 26, 88Feb 13, 90[B43K, G01D]
4891245 Electrophoretic display particles and a process for their preparationExpiredMar 21, 86Jan 02, 90[H01B, B32B]
4833490 Writing element with exchange mechanismExpiredSep 25, 87May 23, 89[G01D]
4769914 Lettering deviceExpiredApr 16, 87Sep 13, 88[B43L]
4764045 Writing instrument with reservoir having perpendicular fibersExpiredApr 16, 87Aug 16, 88[B43K]
4761090 Tubular writing pen tip with adjustment meansExpiredJul 31, 86Aug 02, 88[B43K]
4753546 Pressure balanced stylographic penExpiredJul 24, 81Jun 28, 88[B43K]
4729685 Writing instrument with press mechanism and magnetic catchExpiredJul 24, 87Mar 08, 88[B43K]
4669617 Pen holder deviceExpiredSep 19, 85Jun 02, 87[A47F]
4665107 Pigment encapsulated latex aqueous colorant dispersionsExpiredMar 21, 86May 12, 87[C08J, C09D, C09B, C08K]
4662769 Tubular writing pen tip with adjustment meansExpiredMay 22, 85May 05, 87[B43K]
D287603 Writing penExpiredJun 19, 84Jan 06, 87[]
D286164 Writing penExpiredJun 19, 84Oct 14, 86[]
D284582 Fountain pen for artists and calligraphers or the likeExpiredDec 08, 83Jul 08, 86[]

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