What are some effective mosquito repellants ?

[gongli]

What are some effective mosquito repellants ?

by gongli » Tue Dec 16, 2008 1:43 am

gongli

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I am working on an invention that needs a mosquito repellant - and wondering which method is effective - one preferably of public domain technology. Any suggestions will be appreciated.

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[Scrupulous]

by Scrupulous » Tue Dec 16, 2008 10:13 am

Scrupulous

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Location: United States

• Website

Go here, and type in 'mosquito repellant'...

http://www.google.com/patents

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[gongli]

Any patent received before 20 years ago is public domain ?

by gongli » Tue Dec 16, 2008 10:56 pm

gongli

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On the google patent search, any patents received before 20 years ago is public domain now ?

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