Inventor
RUELL HARTWIG
20 patents
⚠️ This page may combine multiple inventors who share the name “RUELL HARTWIG”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
SIEMENS CORP
10 patentsUS4394773AJul 19, 1983
Fingerprint sensor
SIEMENS CORP280 citations99
US4368979AJan 18, 1983
Automobile identification system
SIEMENS CORP188 citations99
US4385831AMay 31, 1983
Device for investigation of a finger relief
SIEMENS CORP56 citations96
US4340300AJul 20, 1982
Input sensor unit for a fingerprint identification system
SIEMENS CORP67 citations96
US4356396AOct 26, 1982
Fiber optical measuring device with compensating properties
SIEMENS CORP65 citations95
US4428670AJan 31, 1984
Fingerprint sensing device for deriving an electric signal
SIEMENS CORP79 citations94
US4427881AJan 24, 1984
Sensor device for measuring a physical parameter
SIEMENS CORP28 citations92
US4336998AJun 29, 1982
Fingerprint transducer and reading apparatus
SIEMENS CORP46 citations92
US4358677ANov 9, 1982
Transducer for fingerprints and apparatus for analyzing fingerprints
SIEMENS CORP73 citations91
US4355238AOct 19, 1982
Liquid level indicator
SIEMENS CORP19 citations74
SIEMENS AG
8 patentsUS4014602AMar 29, 1977
Identification card having a hologram superimposed on printed data
SIEMENS AG96 citations96
US4171766AOct 23, 1979
Falsification-proof identification card having a Lippmann-Bragg hologram
SIEMENS AG44 citations92
US4269473AMay 26, 1981
Identification card with a hologram and a process for the production thereof
SIEMENS AG72 citations90
US4135251AJan 16, 1979
Method for coded sequential non-coherent, redundant optical data-storage
SIEMENS AG10 citations74
US3936140AFeb 3, 1976
Arrangement for sequential data storage
SIEMENS AG14 citations74
US4175823ANov 27, 1979
Process for holographic recording of data in the form of electrical signals
SIEMENS AG16 citations72
US3947640AMar 30, 1976
Method and device for recording data as holograms in a multi-channel storage tape
SIEMENS AG19 citations72
US3944321AMar 16, 1976
Recording unidimensional holograms with reduced positional sensitivity during readout
SIEMENS AG0 citations41