WIP TECHNOLOGIES, INC.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5791439 Ladder, member for connecting a rail to a horizontal element of a ladder, and method, and apparatus and method for holding a washerExpiredApr 21, 95Aug 11, 98[E06C]
5573081 Ladder top with bail recessExpiredJun 29, 94Nov 12, 96[E06C]
5533591 Ladder rail capExpiredMar 07, 95Jul 09, 96[E06C]
5366051 Hollow plastic ladderExpiredApr 29, 92Nov 22, 94[E06C]
5358070 Ladder topExpiredNov 08, 93Oct 25, 94[E06C]
5165641 Large contact area braces for a ladderExpiredApr 17, 90Nov 24, 92[E04G]
5161909 Packaging clipExpiredOct 29, 90Nov 10, 92[F16B, E06C]
5131495 Hollow plastic ladderExpiredAug 10, 90Jul 21, 92[E06C]
5121814 Adjustable ladder stand-off brace for corner wallsExpiredDec 19, 90Jun 16, 92[E06C]
5113973 Adjustable stand-off brace for a ladderExpiredApr 06, 90May 19, 92[E06C]
5067588 Ladder lashExpiredApr 09, 90Nov 26, 91[E06C]
5067589 Extendable supportExpiredJul 31, 90Nov 26, 91[E04G]
5020757 Ladder jack clamping devicesExpiredJun 15, 87Jun 04, 91[E04G]
4972571 Method of making a ladderExpiredDec 10, 84Nov 27, 90[B21D]
4754842 Ladder safety deviceExpiredJan 26, 88Jul 05, 88[E06C]
4656721 Apparatus and methods for making rail-to-rung joints for ladders and joints for other structural elementsExpiredNov 19, 84Apr 14, 87[B23P]
4561165 Method and apparatus for making hook to rail connection for scaffolds or the likeExpiredJun 04, 84Dec 31, 85[E06C, B25G, B21D]
4286353 Multi-element connection for structural membersExpiredDec 11, 78Sep 01, 81[E05D]
4240522 Extension trestle ladderExpiredDec 11, 78Dec 23, 80[E06C, E04G]
4226302 Sectional ladder lockExpiredNov 30, 78Oct 07, 80[E06C]

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