Dorma Door Controls, Inc.
11Patents
2Active
11Granted
33Portfolio score
Filing activity: Jul 27, 1978 → Jul 7, 2009 · 2 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5913763A | Method for controlling the operational modes of a door in conjunction with a mechanical door control mechanism | Emerging Cross-Sectional Technologies | 85 | Expired |
| US5687507A | Apparatus for selective alteration of operating parameters of a door | Emerging Cross-Sectional Technologies | 84 | Expired |
| US4878265A | Hold-open mechanism for use with a door closer | Emerging Cross-Sectional Technologies | 39 | Expired |
| US5956249A | Method for electromechanical control of the operational parameters of a door in conjunction with a mechanical door control mechanism | Emerging Cross-Sectional Technologies | 36 | Expired |
| US6002217A | Door operating system | Fixed Constructions | 28 | Expired |
| US4375735A | Air lock door control apparatus | Fixed Constructions | 19 | Expired |
| US4419787A | Door closer assist linkage | Fixed Constructions | 18 | Expired |
| US4394787A | Hydraulic door closer construction | Fixed Constructions | 15 | Expired |
| US6499185B1 | Apparatus for holding a door open | Emerging Cross-Sectional Technologies | 6 | Expired |
| US7571629B2 | Positional multiplex keyway system | Emerging Cross-Sectional Technologies | 1 | Active |
| US8347675B2 | Positional multiplex keyway system | Emerging Cross-Sectional Technologies | 0 | Active |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.