SELECT DISTINCT patent.*, YEAR(date) as year FROM patent LEFT JOIN category ON category.patent = patent.patent AND category.type = patent.type WHERE (category.class = '423') ORDER BY assigned_to ASC, date, patent, type |
Total of 3 patents found where: Class is '423';
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T / S | Patent | Date | Description | Patentee | Category | Assigned To |
U | 1,327,781 | January 13, 1920 | Process of Extracting Potassium from Potash-Bearing Silicate Minerals Process of extracting potassium to be used in glass manufacture (see patent 1,312,053; 1,327,782) |
SCHOLES, Samuel R. BRENNER, Ralph F. |
Glass | |
U | 1,327,782 | January 13, 1920 | Process of Obtaining Combined Potassium from Minerals Process of extracting potassium to be used in glass manufacture (see patent 1,312,053; 1,327,781) |
SCHOLES, Samuel R. |
Glass | |
H. C. Fry Glass Co. | ||||||
U | 1,312,053 | August 5, 1919 | Process of Decomposing Potassium Silicates Process of extracting potassium to be used in glass manufacture (see patent 1,327,781; 1,327,782) |
SCHOLES, Samuel R. |
Glass | H. C. Fry Glass Co. |
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