| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 6 | |
| #2 | France | 4 | |
| #3 | United Kingdom | 4 | |
| #4 | United States | 3 | |
| #5 | Switzerland | 1 |
| # | Industry | |
|---|---|---|
| #1 | Electrical machinery and energy | |
| #2 | Measurement | |
| #3 | Control | |
| #4 | Chemical engineering | |
| #5 | Machine tools | |
| #6 | Machines | |
| #7 | Consumer goods |
| # | Technology | |
|---|---|---|
| #1 | Mechanically-driven clocks | |
| #2 | Dynamo-electric machines | |
| #3 | Electric switches | |
| #4 | Alarm systems | |
| #5 | Magnets and transformers | |
| #6 | Making metal sheets | |
| #7 | Electromechanical clocks | |
| #8 | Unspecified technologies | |
| #9 | Mixing | |
| #10 | Sound-producing devices |
| # | Name | Total Patents |
|---|---|---|
| #1 | Volkers Emil | 4 |
| #2 | Emil Volkers | 4 |
| Publication | Filing date | Title |
|---|---|---|
| GB393503A | Improvements in or relating to sound-emitting apparatus | |
| GB346568A | Improvements in or relating to clock balances | |
| US1513299A | Electromagnetically-operated switch gear | |
| GB232433A | Improvements relating to electromagnetically operated switch gear | |
| US1546873A | Alarm device for announcing interruptions in electrical safety plants | |
| US1445365A | Oscillating pendulum | |
| GB190927A | Improvements in or relating to the construction of oscillating pendulums |