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In 1608, Dutch eyeglass maker Hans Lipperhey filed the first patent for a working telescope. The patent was denied.
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| Number | Title | Issue Date |
| 7103240 | Method and apparatus for providing inductive coupling and decoupling of high-frequency, high-bandwidth data signals directly on and off of a high voltage power line The present invention is drawn to an electrically “closed” method and apparatus for transmitting and receiving data signals over a high voltage power line. Inductive coupling is employed for coupling and decoupling the data signal directly on to and off of a sin... | 09/05/2006 |
| 5835014 | Annunciator system Protection of manual override lock and key systems for an electronic security system is provided by an annunciator system which is activated when access to a manual override keyhole is attempted.... | 11/10/1998 |
| 5760678 | Manual modular pull station A pull box for an emergency alarm system is disclosed having a modular construction that accommodates one or more optional modules in order to provide a wide variety of possible configurations. Also, the basic design of the pull station provides for its r... | 06/02/1998 |
| 5670940 | Electronic lock system with occupancy block The electric lock system operates to block access to the room when a guest key has been used and the guest is detected as being present in the room. The lock blocks access to hotel staff and provides the guest greater privacy in the room. The lock system ... | 09/23/1997 |
| 5276438 | Electrophoretic display panel with internal mesh background screen A triode type electrophoretic display (10) includes a pair of substantially identical glass faceplates (12, 14) sealed to a pair of interstitial spacers (16a, 16b) to form a fluid-tight envelope for containing an electrophoretic fluid. An anodized black s... | 01/04/1994 |
