Walter Hammer
9Patents
3h-index
23Co-inventors
57Inventor score
Filing activity: Sep 8, 1975 → Mar 17, 2023
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US7099474B1 | Key and lock device | Physics | 27 | Expired |
| US4015208A | Frequency generator compensated as a function of at least one physical parameter of the environment | Physics | 24 | Expired |
| US9065776B2 | Addressable node unit and method for addressing | Electricity | 4 | Active |
| US6863560B2 | Electrical power plug with secure positioning of the contact prongs | Electricity | 3 | Expired |
| US8656600B2 | Pencil sharpener configured to work with a power drill | Emerging Cross-Sectional Technologies | 3 | Active |
| USD1057013S1 | Pencil sharpener | General | 0 | Active |
| US11590993B2 | Display of signal devices and safety device of a railway vehicle | Performing Operations; Transporting | 0 | Active |
| USD1089403S1 | Pencil sharpener | General | 0 | Active |
| US11753053B2 | Method for operating a rail vehicle network | Performing Operations; Transporting | 0 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.