Delta Systems, Inc.
79Patents
31Active
79Granted
47Portfolio score
Filing activity: Feb 22, 1977 → Nov 4, 2021 · 12 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6609357B1 | Lawn and garden control module | Performing Operations; Transporting | 83 | Expired |
| US4894019A | Torsion spring shorting connector | Electricity | 61 | Expired |
| US6457545B1 | Hall effect seat switch | Performing Operations; Transporting | 50 | Expired |
| US5662213A | Trim switch with waterproof boot | Mechanical Engineering; Lighting; Heating | 44 | Expired |
| US6618022B2 | Radio frequency powered switch | Emerging Cross-Sectional Technologies | 39 | Expired |
| US4336778A | Safety limiter for engine speed | Emerging Cross-Sectional Technologies | 38 | Expired |
| US4294327A | Safety interlock for machine and engine with magneto ignition | Performing Operations; Transporting | 30 | Expired |
| US4795865A | Safety switch for automatic de-activation of a motor vehicle | Electricity | 25 | Expired |
| USD472883S1 | Terminal configuration of a three pole plunger switch | General | 24 | Expired |
| US5424502A | Quick-install seat switch | Emerging Cross-Sectional Technologies | 24 | Expired |
| US6543560B1 | Hydrostatic transmission with integral actuator | Performing Operations; Transporting | 22 | Expired |
| US4369745A | Safety interlock for machine and engine with magneto ignition | Performing Operations; Transporting | 22 | Expired |
| US5528007A | Plunger switch and method of manufacture | Emerging Cross-Sectional Technologies | 20 | Expired |
| US5190019A | Interlock circuit for de-activating an engine | Mechanical Engineering; Lighting; Heating | 19 | Expired |
| US6207910A | Low profile, double pole safety switch and connector assembly | Electricity | 19 | Expired |
| US5613598A | Switch mounting | Electricity | 18 | Expired |
| US4924046A | Trim switch | Electricity | 18 | Expired |
| US5252791A | Ignition switch | Electricity | 17 | Expired |
| US4839478A | Push button safety switch | Electricity | 17 | Expired |
| US5775482A | Snap-in mount for plunger switch | Electricity | 17 | Expired |
| US5221816A | Plunger switch | Emerging Cross-Sectional Technologies | 17 | Expired |
| US6501281B1 | Capacitive, operator-sensing circuit for disabling engine of mobile power equipment | Electricity | 17 | Expired |
| US6655975B1 | Sealed housing assembly | Emerging Cross-Sectional Technologies | 16 | Expired |
| US5608657A | Interactive diagnostic system | Physics | 16 | Expired |
| US4812604A | Torsion spring contact switch | Electricity | 16 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.