| 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 = 'JEFFERY') AND (first_name = 'Joseph A.') ORDER BY date ASC, patent, type |
Total of 8 patents found where: Last Name is 'JEFFERY'; First Name is 'Joseph A.';
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| T / S | Patent | Date | Description | Patentee | Category | Assigned To |
| 1916 | ||||||
| U | 1,186,203 | June 6, 1916 | Apparatus for Use in Manufacturing Articles of Ceramic Material Method of manufacturing spark plugs |
JEFFERY, Joseph A. JEFFERY, Benjamin A. |
Manufacturing | |
| 1917 | ||||||
| U | 1,223,792 | April 24, 1917 | Apparatus for Use in Manufacturing Articles of Ceramic Material Machine for manufacturing spark plugs |
JEFFERY, Joseph A. JEFFERY, Benjamin A. |
Manufacturing | |
| U | 1,240,575 | September 18, 1917 | Method of Preparing Ceramic Articles for Handling Method of manufacturing clay bodies for porcelain insulators |
JEFFERY, Joseph A. |
Manufacturing | |
| 1922 | ||||||
| U | 1,409,953 | March 21, 1922 | Ceramic Insulating Material Porcelain composition using Sillimanite for high electrical and mechanical strength and low coefficient of expansion, which is particularly suitable for spark plugs |
JEFFERY, Joseph A. |
Porcelain | Jeffery-Dewitt Co. |
| 1923 | ||||||
| U | 1,468,947 | September 25, 1923 | Furnace for Decorating Ceramic Ware Kiln for firing porcelain spark plug insulators |
JEFFERY, Joseph A. |
Manufacturing | Jeffery-Dewitt Co. |
| 1927 | ||||||
| U | 1,631,729 | June 7, 1927 | Ceramic Insulating Material Porcelain composition for spark plugs and insulators consisting of Sillimanite and a glassy matrix |
JEFFERY, Joseph A. MONTGOMERY, Earle T. |
Porcelain | Champion Porcelain Co. |
| U | 1,631,730 | June 7, 1927 | Ceramic Material Porcelain composition for spark plugs and insulators consisting of Sillimanite |
JEFFERY, Joseph A. MONTGOMERY, Earle T. |
Porcelain | Champion Porcelain Co. |
| 1929 | ||||||
| U | 1,723,174 | August 6, 1929 | Use of Dumortierite Porcelain composition use the mineral dumortierite which allows firing at a lower temperature |
JEFFERY, Joseph A. RIDDLE, Frank H. |
Porcelain | Champion Porcelain Co. |
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