| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 12 | |
| #2 | Canada | 2 |
| # | Industry | |
|---|---|---|
| #1 | Machine tools | |
| #2 | Machines | |
| #3 | Electrical machinery and energy | |
| #4 | Measurement | |
| #5 | Medical technology | |
| #6 | Textiles and paper | |
| #7 | Consumer goods | |
| #8 | Agriculture |
| # | Technology | |
|---|---|---|
| #1 | Tools for connecting or disengaging | |
| #2 | Unspecified technologies | |
| #3 | Hats | |
| #4 | Footwear manufacturing machines | |
| #5 | Harvesting | |
| #6 | Turning | |
| #7 | Electrically-conductive connections | |
| #8 | Weighing | |
| #9 | Dentistry | |
| #10 | Unspecified technologies |
| # | Name | Total Patents |
|---|---|---|
| #1 | Litchfield Isaac W | 14 |
| Publication | Filing date | Title |
|---|---|---|
| US1728418A | Bottle opener | |
| US1567155A | Electric connecter | |
| US1637778A | Wrench | |
| US1499584A | Tool for drilling or boring metals | |
| US1345202A | Wrench | |
| US1382004A | Selective card-index system | |
| US1201063A | Combined ruler and postal scale. | |
| US1152825A | Dental floss-holder. | |
| US1207947A | Tool. | |
| US1156238A | Bathing-cap. | |
| US976194A | Shoe-tree. | |
| CA115287A | Pneumatic despatch tube apparatus | |
| CA115288A | Pneumatic despatch tube apparatus | |
| US684644A | Harvesting machinery. |