Harold Simpson
11Patents
10h-index
—Co-inventors
51Inventor score
Filing activity: Apr 20, 1984 → Aug 18, 1989
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4824154A | Security lock for double-hung window | Emerging Cross-Sectional Technologies | 87 | Expired |
| US4553353A | Latch for pivotal sash window | Emerging Cross-Sectional Technologies | 74 | Expired |
| US4791756A | Latch for pivotal sash window | Fixed Constructions | 69 | Expired |
| US4901475A | Externally mounted latch for slidable sash window | Fixed Constructions | 64 | Expired |
| US4619122A | Threadably engaged locking mechanism | Emerging Cross-Sectional Technologies | 63 | Expired |
| US4837975A | Externally mounted latch for slidable sash window | Emerging Cross-Sectional Technologies | 60 | Expired |
| US4578903A | Corner locking and associated pivot means for extruded plastic sash windows | Fixed Constructions | 60 | Expired |
| US4622778A | Latch and corner support for pivotal window sash | Fixed Constructions | 58 | Expired |
| US4923230A | Self-contained security lock for double-hung window | Emerging Cross-Sectional Technologies | 52 | Expired |
| US4581850A | Combination pivot corner and slide guide for sash window | Fixed Constructions | 42 | Expired |
| USD292667S | Locking pin | General | 2 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.