Did You Know...
...that two musicians were responsible for the invention of color print film? Fascinated by photography, Leopold Godowsky and Leopold Mannes worked together to produce an easy-to-use, practical color film. They worked full time as music teachers and gave concerts while experimenting during their off hours in Mannes' kitchen. Their success earned them full-time, well-paying jobs at Kodak and their efforts resulted in Kodachrome film, which was introduced in 1935.
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| Number | Title | Issue Date |
| 5371796 | Data communication system In a data communication system a plurality of users are equipped with respective devices for computation and authentication of message authenticators. Each device stores a common cryptographic function; a common secret key and a respective non-secret offs... | 12/06/1994 |
| 5370113 | Breathing apparatus held in a convertible case and garment assembly A self contained breathing apparatus comprises a compressed air cylinder, facemask and hose which when not in use are stored and carried within a case formed from an assembly of flexible sheet material. The elements of the case are constructed such that w... | 12/06/1994 |
| 5323465 | Access control A plurality of portable tokens are issued e.g. for authenticating instructions within an electronic banking network. Each token requires entry of a respective password in order to operate and becomes locked if a number of incorrect password entries are ma... | 06/21/1994 |
| 5323149 | Data communications method with two way communication between master and slave transceivers A data communications system, e.g. for "hands free" personnel location or access control, comprises a master transceiver and a plurality of slave transceivers for transmitting individual identification messages to the master in accordance with a code in w... | 06/21/1994 |
| 5225095 | Foam concentrate An improved foamable protein hydrolysate based concentrate is provided containing multivalent cations and a water soluble polymer, which remains stable in storage for at least six months and which, when diluted with 10 to 50 parts of water and mixed with ... | 07/06/1993 |
| 5207932 | Alcohol resistant aqueous film forming firefighting foam AFFF and ARAFFF firefighting foam concentrates which include alkyl polyglycoside surfactants are provided. These surfactants enhance the performance of the perfluoroalkyl surfactants.... | 05/04/1993 |
| 5195341 | Electronic cylinder lock with inductively coupled key An electronic lock is constructed to resemble the appearance and functionality of a conventional cylinder lock. Its key has a bit in which is mounted an integrated circuit chip storing the key code and including a transmission coil for inductive coupling ... | 03/23/1993 |
| 5133991 | Method for applying a biodegradable protein foam to a substrate A method and apparatus for covering substrates such as landfills, sewage, contaminated soil, sludge deposits, compost piles and the like. A protein based solution, preferably mixed from a foam concentrate, is mixed with air in a foam production nozzle and... | 07/28/1992 |
