US Patent No: 5,421,354

Number of patents in Portfolio can not be more than 2000

Frameless umbrella and canopy




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A self-supporting umbrella canopy has a high strength-to-weight ratio and the ability to compactly fold flat. The umbrella canopy uses a series of collapsible, closed cross-section cells to provide its support and to provide weather protection for a person or persons below. The closed cross-section cells are attached to each other in series so that the umbrella canopy may conveniently unfurl in a radial manner. Construction of the umbrella canopy lends itself to automated processes. Due to the self-supporting nature of the collapsible, closed cross-section cells, lightweight and inexpensive waterproof materials may be used to construct the umbrella canopy.

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International Classification(s)

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Inventor Name Address # of filed Patents Total Citations
Bolton, Douglas A 310 S. Jefferson, #25C, Placentia, CA 92670 4 44

Cited Art Landscape

Patent Info (Count) # Cites Year
Other [Check patent profile for assignment information] (3)
* 4,643,210 Inflatable umbrella 14 1985
* 4,870,983 Inflating article with integrally associated pump 11 1988
* 5,103,848 Sunshade umbrella 5 1990
* 5,197,526 Device for the internal shading of glass areas with a hanging means 16 1990
* 5,043,039 Method of manufacture of expandable and collapsible cellular shades of sheer fabric 29 1990
International Window Fashions, L.L.C. (1)
* 5,188,160 Honeycombed shade 21 1992
Desaleux; Jean (1)
* 4,370,993 Disposable umbrella 5 1981
Comfortex Corporation (1)
* 4,934,434 Suspension and actuation systems for specialty window shades 26 1989
Schon B.V. (1)
* 5,078,195 Double-walled pleated curtain 23 1990
* Cited By Examiner

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
Other [Check patent profile for assignment information] (2)
* 5,682,915 Portable sun screen 5 1996
D437109 Umbrella 16 2000
* 9,051,918 Vertical axis wind turbine with tensile support structure having rigid or collapsible vanes 1 2011
9,133,815 Propeller-type double helix turbine apparatus and method 0 2011
Fu Tai Umbrella Works, Ltd. (1)
* 6,302,125 Simplified flat top umbrella with one-piece umbrella cloth 9 2000
* Cited By Examiner