| 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 = '451') ORDER BY category ASC, date, patent, type |
Total of 7 patents found where: Class is '451';
View a patent by clicking on the patent number. You can sort by any of the columns by clicking on the column name.
| T / S | Patent | Date | Description | Patentee | Category | Assigned To |
| Engraving | ||||||
| U | 108,408 | October 18, 1870 | Improvement in Cutting and Engraving Stone, Metal, Glass &c. Method of sandblashing to cut or engrave |
TILGHMAN, Benjamin C. |
Engraving | |
| Jar | ||||||
| U | 98,270 | December 28, 1869 | Improvement in Machine for Grinding Glass Jars Use of adjustable arms to grind the mouth of glass jars |
KELLY, Alexander W. SAMUEL, John B. |
Jar | |
| Machine | ||||||
| U | 2,355,684 | August 15, 1944 | Insulator Cutting Machine Machine to automatically trim the profile in insulators in an assembly line process |
SKIPPER, Edward M. |
Machine | Locke Insulator Corp. |
| Manufacturing | ||||||
| U | 1,171,205 | February 8, 1916 | Process of Manufacturing Porcelain Articles Method of forming the shape of a spark plug insulator from a dry blank |
JEFFERY, Joseph Arthur JEFFERY, Benjamin Alfred |
Manufacturing | |
| 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 | |
| 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 | 1,904,608 | April 18, 1933 | Insulator Finishing Brushing Machine Machine to grind down interlinking passages in a semi-dry insulator body for metal fittings |
BETTINI, David |
Manufacturing | Locke Insulator Corp. |
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