Did You Know...
...that Kleenex tissue was originally designed to be a gas mask filter? It was developed at the beginning of World War I to replace cotton, which was then in short supply as a surgical dressing.
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 |
| 4686605 | Method and apparatus for altering a region in the earth's atmosphere, ionosphere, and/or magnetosphere A method and apparatus for altering at least one selected region which normally exists above the earth's surface. The region is excited by electron cyclotron resonance heating to thereby increase its charged particle density. In one embodiment, circularly... | 08/11/1987 |
| 4677657 | Voice recording card A voice recording card (1) can record and reproduce a message and when it is inserted into a transmitting and receiving apparatus (3), it can transmit and receive the message. In a recording mode, the message is applied through a microphone (14), converte... | 06/30/1987 |
| 4593384 | Security device for the secure storage of sensitive data A device is disclosed for securely housing and protecting microelectronic circuitry in order to prevent external access to sensitive data stored therein. In a preferred embodiment of the invention, the device includes a ceramic housing which encases elect... | 06/03/1986 |
| 4509758 | Cryptographic game apparatus and mode of play A cryptographic game and apparatus therefor, including an encrypting box with a plurality alphabetically labeled compartments, a plurality of alphabetically labeled members adapted to be randomly placed in the compartments, a first pad of sheets containin... | 04/09/1985 |
| 4409434 | Transistor integrated device, particularly usable for coding purposes In a transaction card such as a credit or payment card provided with an integrated circuit for performing and recording the transaction, communications between the card and an access terminal must be coded so as to prevent fraud attempts. An integrated ci... | 10/11/1983 |
| 4408188 | Electromechanical decoder 1. An electromagnetic decoder comprising a code wheel assembly including a base member, a shaft supported by the base member, a first wheel element and a second wheel element carried by the shaft, a plurality of code posts carried by the first wheel element and preset f... | 10/04/1983 |
| 4286113 | Telephone system eavesdropping device 1. In a telephone system including a telephone microphone at a subscriber's position, a telephone receiver and circuit connections there-between, contact terminals for said circuit connections and a disconnect switch associated with said contact terminals... | 08/25/1981 |
| 4208734 | Underwater communication system 1. In combination, means to generate a first noise signal having predetermined characteristics, means to generate a second noise signal having predetermined characteristics different from that of said first noise signal, means to generate a carrier wave, ... | 06/17/1980 |
| 3936748 | Secret communication system employing magnetic control of signal modulation on microwave or other electromagnetic carrier wave 1. A system for transmitting varying amplitude signals with a high degree of secrecy over a wave transmission medium, including a source of polarized electromagnetic waves of predetermined wavelength at the input to said medium, three transmission devices... | 02/03/1976 |
