| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 20 | |
| #2 | France | 1 | |
| #3 | United Kingdom | 1 |
| # | Industry | |
|---|---|---|
| #1 | Control | |
| #2 | Packaging and shipping | |
| #3 | Machines | |
| #4 | Consumer goods | |
| #5 | Civil engineering | |
| #6 | Computer technology | |
| #7 | Measurement | |
| #8 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Coin-freed | |
| #2 | Unspecified technologies | |
| #3 | Shafts | |
| #4 | Writing or drawing tools | |
| #5 | Transferring liquids | |
| #6 | Measuring volume | |
| #7 | Labelling machines | |
| #8 | Handling thin material | |
| #9 | Gearing | |
| #10 | Data recognition and presentation |
| # | Name | Total Patents |
|---|---|---|
| #1 | Charles Walker | 20 |
| #2 | Walker Charles | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US2395306A | Card selector machine | |
| US2184204A | Dishwasher | |
| US2176828A | Registering mechanism | |
| US2176827A | Liquid dispensing apparatus | |
| US2078821A | Variable control mechanism | |
| US2024320A | Filling station pump | |
| US2056083A | Coin controlled vending machine | |
| US1996665A | Stamp vending and dispensing machine | |
| US1996664A | Safety pencil holder | |
| US1996663A | Strip-serving machine | |
| US2044110A | Multiple universal vending machine for vending solid and liquid bodies | |
| US1946372A | Combined filling station pump and vending machine | |
| US1996662A | Street car signaling device | |
| US1946371A | Stamp vending machine | |
| US1999887A | Vending machine | |
| US1918154A | Vending machine | |
| US1867429A | Vending machine | |
| US1848980A | Safety pencil holder | |
| US1895953A | Multiple vending machine | |
| US1946370A | Vending machine |