John C. Opfer
24Patents
7h-index
21Co-inventors
69Inventor score
Filing activity: Jul 6, 1978 → Apr 3, 2015
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6040538A | Switchgear assembly | Electricity | 34 | Expired |
| US5864107A | Switchgear assembly | Electricity | 14 | Expired |
| US4324959A | Pre-insertion resistor mechanism for a circuit interrupting device | Electricity | 11 | Expired |
| US5600112A | Bushing assembly with circuit interrupters including polyphase operating mechanism | Electricity | 11 | Expired |
| US7626397B2 | High current capable circuit testing closer apparatus and method | Electricity | 8 | Active |
| US5709553A | Flexible connector for high-current conductors | Emerging Cross-Sectional Technologies | 7 | Expired |
| US6180902A | Fault interrupter and operating mechanism therefor | Electricity | 7 | Expired |
| US4237357A | Operating mechanism for a high-voltage switch | Electricity | 6 | Expired |
| US6114642A | Switchgear assembly | Electricity | 5 | Expired |
| US6127637A | Disconnect feature for interrupter | Electricity | 5 | Expired |
| USD722030S1 | Pole unit housing for electrical switchgear | General | 4 | Active |
| US5298704A | Contact operating arrangement with shock-reducing feature for high-voltage apparatus | Electricity | 4 | Expired |
| US4668848A | Alignment and centering arrangement for contacts of an interrupting device | Electricity | 4 | Expired |
| US4203083A | Operating mechanism for a circuit interrupting device | Electricity | 4 | Expired |
| US9576757B2 | Circuit interrupters with air trap regions in fluid reservoirs | Electricity | 3 | Active |
| US6628494B2 | Protective device and system | Electricity | 3 | Expired |
| US5904577A | Separable, flexible electrical connection arrangement | Electricity | 3 | Expired |
| US8681462B2 | Circuit testing closer apparatus and method with in-rush current awareness | Electricity | 2 | Active |
| US4238657A | Switch operator condition and position indicator mechanism | Electricity | 2 | Expired |
| US4683357A | Switch-operating mechanism with improved charging arrangement | Emerging Cross-Sectional Technologies | 2 | Expired |
| US6429393B1 | Current transfer arrangement for circuit interrupter | Electricity | 1 | Expired |
| US6674027B2 | Operating arrangement for mechanism | Electricity | 1 | Expired |
| US7352265B2 | Manual trip control method and arrangement for multiple circuit interrupters | Electricity | 0 | Active |
| US7440251B2 | Multi-path switching configuration | Electricity | 0 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.