| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 6 | |
| #2 | United Kingdom | 3 | |
| #3 | Canada | 2 | |
| #4 | Germany | 2 | |
| #5 | Spain | 2 | |
| #6 | Austria | 1 | |
| #7 | Switzerland | 1 | |
| #8 | France | 1 |
| # | Industry | |
|---|---|---|
| #1 | Machines | |
| #2 | Measurement | |
| #3 | Electrical machinery and energy |
| # | Technology | |
|---|---|---|
| #1 | Postal sorting | |
| #2 | Measuring light | |
| #3 | Electric switches | |
| #4 | Unspecified technologies |
| # | Name | Total Patents |
|---|---|---|
| #1 | Ladd Lester L | 4 |
| #2 | Rundell Frans Ripert Emanuel | 1 |
| #3 | Products Corporation Photometr | 1 |
| #4 | Crites Virgil C | 1 |
| #5 | Rundell Rupert E | 1 |
| #6 | Ladd Lester Lyle | 1 |
| Publication | Filing date | Title |
|---|---|---|
| GB287596A | Improvement in color-controlled sorting machine | |
| US1626359A | Color-sorting machine | |
| GB196307A | Sorting machine | |
| US1432762A | Sorting machine | |
| US1649168A | Selecting device | |
| DE369451C | Photometer | |
| GB184853A | Photometric devices | |
| US1685921A | Selective control device | |
| US1396221A | Sorting-machine | |
| US1552679A | Photometric device | |
| CA272190A | Colour sorter | |
| CA234669A | Sorting machine |