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What are some effective mosquito repellants ?

Postby gongli » Tue Dec 16, 2008 1:43 am

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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.

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

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

http://www.google.com/patents

Any patent received before 20 years ago is public domain ?

Postby gongli » Tue Dec 16, 2008 10:56 pm

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

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