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SELECT DISTINCT patent.*, YEAR(date) as year FROM patent LEFT JOIN name ON name.patent = patent.patent AND name.type = patent.type WHERE (last_name = 'ROBERTSON') AND (first_name = 'John C.') ORDER BY date ASC, patent, type

Total of 1 patents found where: Last Name is 'ROBERTSON'; First Name is 'John C.';

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T / S Patent Date Description Patentee Category Assigned To
 1931
U 1,822,458 September 8, 1931 Measuring Apparatus
Device to measure the density of clay slip		 ROWLAND, Davidge H.
ROBERTSON, John C.
 Manufacturing Locke Insulator Corp.

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