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Patent information can be obtained online for patents granted from 1976 to the present with word searches using phrases to describe the invention information you're looking for.
The Boolean method allows you to use more than one word at a time. For instance you can key in ‘telescope' and ‘glass'. This will show you patents that relate to both of your chosen words. To expand or deepen your search, you can comb these related patents for additional words and phrases that you can then use in another search.