Yellow BizArt Wing Quad kite only [3Wind] Last 3pcs
Brand: Three Wind Kite
Dimension: 240cm X 80cm
Sail: Taiwan Imported Nylon Fabric (Parachute Fabrics)
Based on the Polished P300 Rod,
Vertical bar 7.2mm X 6mm wrapped Carbon Rod
Packaging: Softcover bag
Wind Level: 2-4 wind
Features: Suitable for flying around in the wind 2-4,
a sharp climb and dive, ride strong effects
Notes: Need to purchase Quad line and Quad handle.
Are they Replicas, Counterfeit items, and unauthorized copies of revkites?
No. The Patent is over 20 years. Patent protection lasts for a limited amount of time,
usually 20 years from the date of the application,
and is only effective in the country in which it was filed
(Source from US Patent & Trademark Office)
Once the patent expires, other companies can produce the kites using the same materials and bring their version to the market, introducing competition and generally lowering the prices for it, or for further improvement by other inventors. (Source from Wiki Patent)
Once a patent expires, the protection ends, and an invention enters the public domain, that is, the owner no longer holds exclusive rights to the invention, which becomes available to commercial exploitation by others.
Example are the invention of cars, light bulbs, ball pens.
There are many models in the markets.
Using SkyShark Rod:
P90 in a sul type revalike (same weight as rev): 2 to 6mph,
P200: 6mph to 10mph.
P400 in vented rev from 10 mph to about 15 to 20mph.