COMMUNICATIONS RECEIVED. acknowledges with much pleasure the re ceipt of original papers and contributions upon the following subjects : [OFFICIAL. Index of Inventions Letters Patent of the United States EXTENSIONS GRANTED. DISCLAIMER. DESIGNS PATENTED. TRADE MARKS REGISTERED. 020 050 0.5 VALfiE OF PATENTS How Can I Best Secure My Invention? Preliminary Examination. Reissues. Caveats. Design Patents. Rejected Cases. Value of Extended Patents. To Make an Application for a Patent Trademarks. Canadian Patents. OBTAIN, scientific american, 1873-08-30
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