Issued Patents All Time
Showing 1–22 of 22 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4823015 | Electrical interference free projected beam smoke detector | Douglas L. Mason, Kenneth J. Leff, John N. Schide, Ralph Giffone | 1989-04-18 |
| 4749871 | Self-diagnostic projected-beam smoke detector | Douglas L. Mason, Kenneth J. Leff, John N. Schide, Ralph Giffone | 1988-06-07 |
| 4728936 | Control and display system | John K. Guscott | 1988-03-01 |
| 4687924 | Modular transceiver with adjustable specular member | Douglas L. Mason, Kenneth J. Leff, John N. Schide, Ralph Giffone | 1987-08-18 |
| 4679881 | Electrical interconnection apparatus and technique | Hugh D. Dyer, Kenneth J. Leff | 1987-07-14 |
| 4636774 | Variable sensitivity motion detector | James B. Edson, John K. Guscott | 1987-01-13 |
| 4614968 | Contrast smoke detector | William J. Rattman, Stephen Marchetti | 1986-09-30 |
| 4551857 | Hot weather hat | — | 1985-11-12 |
| 4544836 | Optically-based access control system | Roy Harvey, Kenneth J. Leff | 1985-10-01 |
| 4538138 | Integrated security system having a multiprogrammed controller | Roy Harvey, Kevin J. Griffin, Louis H. Auerbach | 1985-08-27 |
| 4491828 | Two-wire multi-zone alarm system | Roy Harvey | 1985-01-01 |
| 4468664 | Non-home run zoning system | John K. Guscott, Martin E. Henderson, Roy Harvey | 1984-08-28 |
| 4427888 | Infrared imaging system | — | 1984-01-24 |
| 4423410 | Two-wire multi-zone alarm system | Roy Harvey | 1983-12-27 |
| 4383250 | System for intrusion detection | — | 1983-05-10 |
| 4359721 | Two-wire multi-zone alarm system | Roy Harvey | 1982-11-16 |
| 4331952 | Redundant sensor adapter | Kevin Flynn | 1982-05-25 |
| 4321594 | Passive infrared detector | John K. Guscott | 1982-03-23 |
| 4321592 | Multiple sensor intrusion detection system | Richard E. Crandall, Sheldon Apsell | 1982-03-23 |
| 4303908 | Electronic sounder | Robert B. Enemark, Stephen Marchetti | 1981-12-01 |
| 4206449 | Multiple sensor intrusion alarm system | Sheldon Apsell, Daniel Crown | 1980-06-03 |
| 4195286 | Alarm system having improved false alarm rate and detection reliability | — | 1980-03-25 |