Bizarre Patents
Pizza Pie With Concentric Rings of Crust
A pizza mold for forming a plurality of concentric raised ridges of dough (i.e., crust) on the surface of a pizza pie.
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 4847488 | Sabotage resistant light barrier wherein radiation is polarized into two opposite types of polarization In a reflection light barrier, improved security against sabotage is achieved through the simultaneous use of radiation with opposite types of polarization, e.g., by means of radiations polarized linearly perpendicular to one another, or radiations polari... | 07/11/1989 |
| 4778996 | Ceiling mounted passive infrared intrusion detector with pyramidal mirror A ceiling mounted passive infrared detector has an enclosure arranged for mounting to ceiling, a downwardly pointing infrared detecting element within the enclosure, a first multifaceted pyramidal mirror having an apex pointing upwardly toward the detecti... | 10/18/1988 |
| 4757204 | Ceiling mounted passive infrared intrusion detector with dome shaped lens A passive infrared intrusion detector is arranged for mounting to the ceiling of a room to be protected. Infrared radiation from points within the room is focused onto an infrared sensing element by a multi-segment dome-shaped lens. The multi-segment lens... | 07/12/1988 |
| 4757303 | Alarm system In an alarm system with a number of alarm devices such as fire intrusion alarm devices connected to a signal center, upper and a lower thresholds are defined in the alarm devices, with the inactive value of the sensor output signal located between the thr... | 07/12/1988 |
| 4516115 | Intrusion detection system The present invention provides an improved intrusion detection system of the type in which interruption of a beam of infrared energy transmitted from a transmitter to a receiver generates an alarm signal. The receiver includes a light source which remains... | 05/07/1985 |
| 4510488 | Passive infrared intrusion detector A passive infrared intrusion detector is configured to resemble an electrical wall outlet. The unit includes a light for visually indicating the direction of its beam of sensitivity, and a lens unit which facilitates directional adjustment of the beam.... | 04/09/1985 |
| 4484075 | Infrared intrusion detector with beam indicators A passive infrared intrustion detector is provided with a lens which has a plurality of first lens segments, each for focusing infrared radiation from various beams of sensitivity onto an infrared detecting element. Associated with each of the first lens ... | 11/20/1984 |
