Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 7954891 | Foldable chair with retractable armrests A foldable chair has an armrest retracting structure that includes two plate elements placed below each armrest, each plate element having a guide slot with a linear section and a reverse turn section. A first pivotal axle passes through the plate elements and conne... | 06/07/2011 |
| 7628450 | Collapsible chair The present disclosure relates to collapsible chairs in which the backrest, seat, and legrest portions can be folded into a relatively compact configuration. The present disclosure provides a collapsible chair including a backrest having an upper portion and a lower... | 12/08/2009 |
| 7401854 | Stackable folding chair A stackable folding chair has a seat and a back pivotably attached to the rear edge of the seat. Front legs are pivotably attached at right and left edges of the seat. Rear legs are pivotably attached to the bottom of the seat. Armrests are pivotably attached to the... | 07/22/2008 |
| 7334836 | Foldable chair A foldable chair includes a rear leg connected pivotally to a front leg, a carrier frame retained pivotally on the rear leg, a locking seat provided on the front leg and formed with first and second engaging portions, and a slide member mounted to a front arm part o... | 02/26/2008 |
| 7156459 | Stackable chair A stackable chair has a backrest mounted on back supports by resilient mount units for tilting between an upright position and a tilted-back position. Each mount unit includes a rigid coupling member having a lower portion received within an upper end portion of the... | 01/02/2007 |
| 7066534 | Hard arm chair with sliding arm mechanisms A collapsible chair (10), having a frame assembly (16) including a number of frame members (20), the upper ends of the frame members (20) being pivotally attached to upper pivot assemblies (36, 38), and the lower ends being pivotal... | 06/27/2006 |
| 7063380 | Collapsible easy chair This invention discloses a leisure time use easy chair, especially for use in the garden or camping. The chair includes a back, a seat, and a leg rest, with a piece of fabric stretched over the surfaces being formed by these elements, a pair of armrests, and a base ... | 06/20/2006 |
| 6902231 | Collapsible chair A collapsible chair includes front and rear leg members interconnected pivotally at upper end areas. A connector is connected pivotally to the rear leg member, and an extension limiter is connected pivotally to the connector at one end and to the front leg member at... | 06/07/2005 |
| 6824208 | Single-motion collapsible quad chair with solid armrest A quad chair (100) with solid armrests (130) collapses in a single movement in which (a) the front legs (110) approximate each other when the front legs and the rear legs (120) pivot towards each other, and (b) the armrest slidingly moves... | 11/30/2004 |
| 6692068 | Deck chair A deck chair has a frame having a back frame, a seat frame, a leg frame, a front support frame, a rear support frame outside the back frame and two side stretchers. Two positioning members pivotally mount the back frame to the seat. Two armrest-adjusting ... | 02/17/2004 |
| 6601912 | Folding chair with hard arms A folding chair with hard arms has front and rear support tubes, left and right support tubes, chair back auxiliary tubes. The left and right support tubes are bent upward to form the arm support tubes. One end of a hard arm is pivotally connected to the ... | 08/05/2003 |
| 6517152 | Folding chair enabling reduced collapse height and volume A folding chair includes front and rear leg members, armrest members, a backrest support member, and a seat that are pivotally connected to one another to enable collapsing or extending of the folding chair. The folding chair is characterized in that the ... | 02/11/2003 |
| 6511122 | Foldable chair having a reduced storage space in a folded state and adjustable backrest inclination A foldable chair includes a backrest, a seat member, a pair of elongated armrests, a pair of front legs and rear legs, and a pair of connecting members. The seat member has a rear end connected pivotally to a lower end of the backrest. The front leg has a... | 01/28/2003 |
| 6371896 | Exercise apparatus and process of adjusting same Exercise apparatus and process of adjusting the exercise apparatus. The exercise apparatus includes a basic frame, a bench unit, including a back part and a seat part, which is vertically adjustable on the basic frame between a sitting position and a lyin... | 04/16/2002 |
| 6030032 | Armrest for a chair An armrest for a chair includes an armrest frame formed with an elongated channel with a bottom opening, a hollow mounting seat disposed in the channel, and a shaft extending slidably through the mounting seat along an axis parallel to the armrest frame a... | 02/29/2000 |
| 5584529 | Folding chair A folding chair includes a pair of posts, a pair of foldable armrests having one end slideably and pivotably connected to the posts, a seat having one end pivotably connected to the posts and another end pivotably connected to the armrests, and a pair of ... | 12/17/1996 |
| 5294171 | Safe multi-functional foldable leisure chair A safe multi-functional foldable leisure chair composed of a chair frame body, a chair pad disposed thereon, and a waters guiding pad, wherein the water-guiding pad is optionally detachably disposed on the chair frame body, permitting the leisure chair to... | 03/15/1994 |
| 4787671 | Folding 3-piece chair with link control A folding chair has three U-shaped frame members supporting the seat and back rest and providing arm supports, and two connecting links controlling folding and unfolding for storage and use. Flexible material for the seat and back rest is removably attach... | 11/29/1988 |
