LandOfFree

LandOfFree
- Canada
- Charities
- Companies
- MP Candidates
- Patents
- Employee Salary Disclosure
- World
- Places of the World
- Scientific Papers
- United States
- Banks
- Companies
- Counties
- Patents
- Employee Salary Disclosure
Menu
Sign in

LandOfFree [ US Patents ]

Say what you really think.

US Patents

Back flow prevention device

Fluid handling – Back flow prevention by vacuum breaking – Air vent in liquid flow line

Patent

[ 0.00 ] – not rated yet Voters 0 Comments 0

Please leave your Comment & Rating

How useful is this invention? - Does humanity need patent for this invention?

Very useful

Somewhat useful

Not sure

Somehow useless

Completely useless

Rate originality. - plagiarist, copy or a brand new idea

Genial

Original

Not sure

Copied from somewhere

Already used for thousands of years

Is it obsolete or futuristic?

Well ahead of time

Somewhat futuristic

Not sure

Somewhat obsolete

Completely obsolete

If you were patent examiner would you approve this patent?

Yes

Most likely

Not sure

Probably not

Definitively not

Does this invention solve a specific problem?

Yes

It might

Not sure

Bloory idea and bloory practical use

Very broad patent, without practical use

What is the true purpose of this patent? - Does this patent serve only to stop other inventors persuing an idea, or it is patented to solve a specific problem?

Patented to preserve knowledge

Defensive patent

I am not sure

Manufacturing base and used to stop/slow down rivals

Serves only patent trolls

Your name

Your email

We need your valid email address to send you a verification email. Without confirming the verification email your rating will not be published. Your email address will NOT be published. Please check your spam folder if you do NOT receive this verification email.

Your opinion

I agree with the Terms of Use

All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.

Canada

Charities
Companies
MP Candidates
Patents
Employee Salary Disclosure

World

Places of the World
Scientific Papers

United States

Banks
Companies
Counties
Patents
Employee Salary Disclosure

Visitors

Benefits
Rating calculations
US Patents
LandOfFree.com
FAQ

Info

About our project
About us
Terms of Use
Privacy Policy
News
Support

LandOfFree.com 2009 – 2023