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| Number | Title | Issue Date |
| 7267197 | Add-on extension ladder An add-on extension ladder is removably mountable to a portion of a conventional ladder to extend the reach of the conventional ladder without any structural modification to the conventional ladder. The add-on extension has integral elements for engaging rungs on th... | 09/11/2007 |
| 4519478 | Ladder extension coupling A ladder extension is disclosed comprising two separable sections to be coupled together in longitudinally overlapping relation by first coupling means coupling a portion of a first ladder section proximate one end thereof to the second section so as to p... | 05/28/1985 |
| 4226302 | Sectional ladder lock There is disclosed herein a sectional ladder having at least a pair of ladder sections adapted to be slideably moved relative to the other for extension or retraction, one section carrying means adapted to engage a latch mounted on the other section for a... | 10/07/1980 |
| 4082162 | A-frame ladder extender The invention is concerned with a combination comprising an A-frame ladder which comprises a pair of main side rails having parallel steps disposed therebetween, a pair of rear side rails pivotally secured with a top end thereof adjacent a top end of the ... | 04/04/1978 |
