Dear sir
I have read your job description and i can help you in designing for the patent you mentioned.
I am a product/industrial designer engineer with 5 years experience in mechanical design,CAD/CAM design, product design, 3D modeling,3D rendering, 3D printing, prototyping and industrial design. I use Autocad, 3ds Max and Solidworks. Moreover, i can give you the quality of a company with price of freelancer and deliver in schedule.
here is a sample of my work and there is more available
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https://www.freelancer.com/u/engmahmoudsayed.html
Kindly note that this is not an exact estimation of price and delivery time. You can add me on skype to talk more about your project and we can negotiate about cost and duration. We can communicate via freelancer chat and Skype too.
hope to hear from you soon
best regards