Did You Know...
...that Charles Goodyear performed some of his experiments on rubber while in debtor's prison? He was there so often he referred to it as his "hotel". Chronically in debt because of poor business sense and ill health, Goodyear depended on the generosity of friends and family. Even after he unlocked the secret to vulcanizing rubber, he was unable to improve his financial situation. When he died, his estate was $200,000 in debt.
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| Number | Title | Issue Date |
| 7530429 | Ladder having expandable members A ladder including: first and second expandable members, each of the first and second expandable members including: a covering capable of expansion, the covering defining a cavity; and expansion means for expanding foam in the cavity in an expansion direction to exp... | 05/12/2009 |
| 7370725 | Motorized rungless ladder A device supported by a ground surface and a structure for at least one of elevating and descending a user. The device includes a first guide rail having a first channel extending along a length thereof and a second guide rail having a second channel extending along... | 05/13/2008 |
| 7370598 | Power driven marine ladder A power driven marine ladder apparatus includes a vertically extendable cable section and a horizontally extendable rung section connected transversely to the cable section. An axially rotatable winder is mounted on a marine vessel or fixed marine structure and the ... | 05/13/2008 |
| 7308965 | Noise abatement wall A noise-absorbing device includes a substantially flat base and embossed and/or hollow elements each including at least one recess. This base reveals with the embossed and/or hollow elements, a configuration exhibiting a fractality zone of between 1 cm and 50 cm, of... | 12/18/2007 |
| 7232010 | Modular hunting ladder A hunting ladder for attachment to a tree or pole includes a plurality of ladder sections that can be assembled together to form a rigid structure, including side rails and rungs extending between the side rails. In an exemplary embodiment, the side rails comprise e... | 06/19/2007 |
| 7207416 | Reinforcement pad for protecting a swimming pool liner from becoming damaged by a swimming pool ladder A reinforcement pad for protecting a liner of a pool from damage caused by a user ascending and descending a pool ladder having two upper ends and two lower ends. The reinforcement pad has a substantially oval pad base and a substantially cylindrical socket extendin... | 04/24/2007 |
| 7152849 | Fastener An assembly is formed from a fastener and a plurality of elongate members. The fastener includes a wedge. A first elongate member is disposed through an opening in a second elongate member. The fastener engages the first elongate member, and the wedge engages the se... | 12/26/2006 |
| 7051839 | Camouflage device for equipment legs A device for providing three dimensional camouflage to a hunter's ladder stand having a seat, footrest, side rails and a plurality of rungs. The device has a hollow plastic tube with a split and holes through which a plurality of stalks of artificial vegetation are ... | 05/30/2006 |
| 6941705 | Accessory for modular elements for the support and ventilation of crawl spaces, floor structures, floors or similar articles in the building field Accessory (20) for modular elements (10) for the support and ventilation of crawl spaces, floor structures, floors or similar articles in the building field, each comprising an upper horizontal wall (11) and a plurality of vertical supporting le... | 09/13/2005 |
| 6932193 | Boat bow access ladder for trailer A boat ladder attached to a trailer for easy access to a bow of a boat. The ladder comprises two side rails with spaced-apart steps or rungs between the side rails, the lower portion of one of the side rails curving a predetermined distance toward the other side rai... | 08/23/2005 |
| 6923214 | Device for servicing an aircraft on the ground A device for servicing an aircraft on the ground includes a rolling support and a cable or hose assembly having a first end for connection to a ground unit and an opposite second end for connection to the aircraft. A reel is rotatably mounted on the rolling support ... | 08/02/2005 |
| 6691828 | Scaffold stair A scaffold stringer which is a plate and a series of tread mounts attached at substantially uniform distances along the plate, the tread mounts forming an angle with the plate, each tread mount having an associated finger projection positioned above each ... | 02/17/2004 |
| 6497304 | Step ladder An improved step ladder of a type having at least one step and a corresponding number of step pads. The improvement includes each step pad being replaceably and interchangeably attached to an associated step, each step having a plurality of throughbores e... | 12/24/2002 |
| 6467234 | Stairway system A prefabricated stairway module (10, 11) comprises a first step and a second step, each step (14) having a tread member (13) and a riser member (15). The stairway module further has fixing means (31) for fixing the module to a sloping surface on which it ... | 10/22/2002 |
| 6415891 | Scaffold stair A scaffold stringer which is plate and a series of tread mounts attached at substantially uniform distances along the plate, the tread mounts forming an angle with the plate, each tread mount having an associated finger projection positioned above each tr... | 07/09/2002 |
| 6386320 | Portable support structure useful as ladder or stepladder The invention concerns a support structure characterized in that it comprises at least: a shaft (1) whereof the two ends are designed to be urged to rest on two fixed elements, one of which may be the ground and the other, a fixed object located above the... | 05/14/2002 |
| 6378654 | Ladder pivotally attached to a generally vertically extending surface A ladder attached to a generally vertically extending wall or surface which is particularly useful when attached to the side of vehicles which can pivot outwardly to a slight extent at the bottom area thereof in order to increase the climbing inclination ... | 04/30/2002 |
| 6129179 | Laterally extensible ladder A laterally extensible ladder comprises first and second uprights having a plurality of adjacent rung assemblies mounted therebetween. Each rung assembly includes a first hollow rung element that defines a rung axis and a second rung element received in t... | 10/10/2000 |
| 5896946 | Boarding ladder and winch mount system for boat trailers and the like An access step and winch mounting assembly is provided for a load carrying device, such as a boat trailer. The assembly includes a front member for mounting on a frame of the trailer, a top member extending from the front member and a cross bar connected ... | 04/27/1999 |
| 5692581 | Anti-slip device for ladder rungs A cover for a rung of a ladder consisting of an elongate member (12) configured to spring clamp over the rung of the ladder and a layer (16) of anti-skid or anti-slip material removeably fastened to the external surface of the cover. The elongate member i... | 12/02/1997 |
| 5515942 | Ladder stiles and ladders produced therefrom The invention is directed to strong, lightweight, electrically non-conducting ladder stiles and ladders formed therefrom. Each ladder stile comprises a tension and compression portion structurally interconnected by a spacing portion. The spacing portion h... | 05/14/1996 |
| 5515657 | Winding stair A winding stair for spiral ascension within a building structure. The stair includes a newel post which has a plurality of elongated slots horizontally formed around the periphery at different elevations. Each steps of the winding stair is provided with a... | 05/14/1996 |
| 5343980 | Child/parent play ladder A ladder which makes it possible for one person to climb onto another, particularly, a ladder which can be worn by an adult for the purpose of enabling a child to climb up the ladder and onto the adult. The top portion of the ladder is attached to a harne... | 09/06/1994 |
| 5323874 | Combination ladder and stair The invention disclosed comprises a combination ladder and stair for use by children which incorporates stair-like treads and risers with ladder-like rungs to achieve safe climbing activity. The combination ladder and stair is adapted to be used at a comp... | 06/28/1994 |
| 5277272 | Manhole ladder A non-metallic ladder for use in a manhole in which permanent manhole steps have been installed and spaced relation from the top of the manhole to a position above the bottom and there being a pair of spaced side members on said ladder connected transvers... | 01/11/1994 |
| 5277273 | Simplified unitary tree climbing device A readily portable device for enabling a vertical columnar structure such as a tree, pole or the like to be climbed without causing damage thereto, this device comprising a pair of rigid, elongate longitudinal members of substantially equal length. These ... | 01/11/1994 |
| 5203427 | Fire escape ladder with integral air cushion A portable fire escape ladder with an inflatable air cushion is provided. The ladder has an upper window sill engaging portion, and a plurality of frame members interconnected with rungs. The air bag is inflated by propellant from a trigger operable prope... | 04/20/1993 |
| 5180031 | Gardener's aid for sloped ground A gardener's aid for sloped ground formed of first and second elongated paralleled spaced apart strut members, a plurality of generally flat spaced apart paralleled support members each having one end affixed to a first strut member and the other end affi... | 01/19/1993 |
| 5145031 | Electric ladder An adjustable ladder comprising, a pair of side supports, a device for retaining the supports in a spaced relationship, a rung, a device for slidably mounting the rungs in the supports, and a device for moving the rung along the supports for adjusting the... | 09/08/1992 |
| 5080193 | Improved hunter's ladder stand An improved hunter's ladder stand includes irregularly shaped legs and rungs which provide structure that blends into an outdoor environment comprising irregularly shaped trees, branches and shrubs. The irregular shape of the hunter's stand provides less ... | 01/14/1992 |
| 5060757 | Adjustable rungs for ladder Adjustable cross pieces or rungs for aiding in forming a ladder using a tree cut at predetermined lengths and trimmed of branches. The cross members include two end members and a centrally located channel member which receives an elongated main body porti... | 10/29/1991 |
| 5058339 | Curved stairway and method A curved stairway is illustrated wherein the usual wooden components, including the stringers A, are provided with steel reinforcement, including metallic stringers B provided with cross bracing D and E in order to provide a composite structure affording ... | 10/22/1991 |
| 4997061 | Ladder assembly, particularly for use with swimming pools An A-frame ladder comprises two side rail assemblies and a platform guard rail assembly each provided in their rail members with elongate oval apertures defining handholds or hand grips. Steps of the side rail assemblies and the platform of the platform g... | 03/05/1991 |
| 4991690 | Portable hunting ladder A portable hunting ladder has a base section and one or more slidably connected ladder sections. Each ladder section has a stand-off device and a device for securing the section to the tree being climbed. The ladder sections are fabricated from tubular cr... | 02/12/1991 |
| 4974701 | Step ladder construction A step ladder construction is provided comprising a plurality of steps extending between a pair of struts. Coupling means join each of the steps with the pair of struts. Each of the struts has the shape of a channel with a pair of spaced webs between whic... | 12/04/1990 |
| 4967879 | Ladder A ladder, especially for use in manholes, where the rungs are mounted in double-walled sidepieces via respective sleeves. Each sleeve has a body wall that, to uniformly support introduced forces, extends through both walls of a sidepiece and, especially f... | 11/06/1990 |
| 4724925 | Boat boarding ladders A boarding ladder which may be mounted on a topsides surface of a boat to be swingable between a raised position where all parts of the ladder are above the waterline of the boat and a lowered position where at least one step of the ladder extends below t... | 02/16/1988 |
| 4716988 | Ladder step construction for use with recreational vehicles and boats A new construction method for a ladder for use on recreational vehicles and boats is disclosed. The ladder comprises two parallel metal tubular rails and a plurality of extruded aluminum steps, including step end caps. The steps are a unique triple-void h... | 01/05/1988 |
| 4715474 | Scaffold system A portable scaffold having tubular structural elements has necked fittings extending into the ends of the tubular elements and attached thereto by adhesive which is introduced through an entry port preferably provided by a porting ring sleeved on the neck... | 12/29/1987 |
| 4687076 | Segment connector for modular ladder A segment connector to connect two segments of a modular ladder which have through holes near ends of the segments includes: a connector housing having a top open end, a bottom open end, and a side wall, the connector housing being sleeved partially over ... | 08/18/1987 |
