Did You Know...
...that in 1800 ether was first used by partyers as a fun diversion? Sniffing the gas led to hilarious and raucous laughter as people watched each other become more and more intoxicated and silly. Several doctors independently realized the value ether would have to anesthetize surgery patients. Of those who claimed rights to the "discovery," none had a happy ending. One had a seizure and died defending his rights. Another spent his life in an asylum because he had been denied acclaim. A third became addicted to chloroform and, in a New York City jail, he soaked a cloth in the drug, severed an artery and bled to death.
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| Number | Title | Issue Date |
| 7187928 | Call delivery systems for roaming prepaid subscribers The invention provides systems and methods that operate to provide seamless roaming to a prepaid subscriber in as many markets as possible. To that end, the systems of the invention include a location register (LR) that can determine the type, or class, of serving m... | 03/06/2007 |
| 6441876 | Liquid crystal display device and method of producing the same A TFT substrate is provided near its outer periphery with a metallic wiring and pad portions, and a conductive light-shielding film is provided on the outside of these. The conductive light-shielding film is left annularly along the outer peripheral porti... | 08/27/2002 |
| 6104795 | Method and apparatus for detecting and announcing pin fraud on coin telephones that use battery reversal pulses to meter charges Pin fraud of battery reversal pulse metered sophisticated coin telephones is detected, an announcement of the detected fraud made, and the fraud is stopped if the detected fraud continues by the method and apparatus of the invention. By carefully monitori... | 08/15/2000 |
| 5757896 | Method and apparatus for preventing pin fraud on coin telephones that use battery reversal pulses to meter charges Pin fraud of battery reversal pulse metered sophisticated coin telephones is detected and prevented by the method and apparatus of the invention. By carefully monitoring within the switch office the loop current that is flowing in the 48 volt battery circ... | 05/26/1998 |
| 5361297 | Method and apparatus for providing answer supervision and an autonomous pay telephone incorporating the same A method and apparatus for telephone call answer supervision, capable of detecting the completion of both national and international calls, which employ different answer confirmation formats, and provide confirmation that a placed call has been answered i... | 11/01/1994 |
| 5187739 | Answer supervision circuit for paystation telephone with non-muted microphone A call progress circuit for both a customer owned, coin operated telephone and a regulated telephone is provided that does not mute the paystation's transmitter, so that voice signals from the calling party may be heard by the called party, thereby preven... | 02/16/1993 |
| 4777647 | Pay station telephone interface An interface (10) is disclosed for coupling a conventional pay station telephone (12) to a telephone switching system (16). The interface (10) provides supervision signal detection functions normally provided by a switching system, and thus can be connect... | 10/11/1988 |
