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Felix Hoffmann, a German chemist, was searching for something to relieve his father's arthritis. In doing so, he "rediscovered" acetylsalicylic acid and in 1900, patented a stable process for developing it. Hence, we have aspirin.
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| Number | Title | Issue Date |
| 5714213 | Securtiy element A security element for the authentication of a substrate has a pattern comprising optical diffraction elements which are embossed in a carrier material of plastic material and unembossed neutral areas. On the embossing side of the carrier material a refle... | 02/03/1998 |
| 5538753 | Security element A security element for the authentication of a substrate has a pattern comprising optical diffraction elements which are embossed in a carrier material of plastic material and unembossed neutral areas. On the embossing side of the carrier material a refle... | 07/23/1996 |
| 5304813 | Apparatus for the optical recognition of documents An apparatus for the optical recognition of documents (1) extends over the entire width of a transfer plane (3). Regularly disposed photoelectric elements (4), whose optical axes create a single sensor plane (5) that is perpendicular to transfer plane (3)... | 04/19/1994 |
| 5287516 | Demodulation process for binary data Two signals at different frequencies are optionally amplified or attenuated in an automatic gain control amplifier (1) after their reception, then separated from each other by means of band pass filters (2, 5) and amplitude-modulated by means of envelope ... | 02/15/1994 |
| 5282612 | Plural compartment cartridge for flexible bills A cartridge for holding flexible bills in first and second stacks, comprises a cuboid housing having first and second openings on oppositely located walls thereof, a mechanism for opening and closing the first and second openings, and pressure plates disp... | 02/01/1994 |
| 5278500 | Planar, core saturation principle, low flux magnetic field sensor A device is disclosed for measuring low-flux magnetic fields with a sensor operating according to the core saturation principle. The sensor is provided with a ferromagnetic core, an excitation coil and a measuring coil. The measuring coil, the excitation ... | 01/11/1994 |
| 5276396 | Planar magnetic harmonic sensor for detecting small quantities of magnetic substances A device is disclosed for detecting the presence and/or determining the configuration of a magnetic substance. The device includes a magnetic circuit having a magnetic core and an air gap. Coupled to the magnetic circuit are an excitation coil, for period... | 01/04/1994 |
| 5276631 | Process for automatic calibration or re-calibration of measurements of a physical variable A calibration process utilizes two nearly identical sensors. The characteristic output curve of the first sensor is obtained using the measuring outputs of the second sensor. In particular, the first sensor has a characteristic output curve f[x] where x i... | 01/04/1994 |
| 5262715 | Arrangement for the measurement of reactive power or reactive energy A circuit is disclosed for measuring reactive energy or reactive power. The circuit comprises a main multiplier, a signal/frequency converter, and a frequency divider all connected in series to form a cascade circuit having an output connected to a displa... | 11/16/1993 |
| 5247202 | Plurality of arrangements each including an IC magnetic field sensor and two ferromagnetic field concentrators, and a procedure for incorporating each arrangement into a package In an embodiment of the invention, a magnetic sensor comprises an IC magnetic flux sensor and two magnetic flux concentrators (18,19) which are each a section of a ferromagnetic lead frame. A section (18b) of a first magnetic flux concentrator (18), a sem... | 09/21/1993 |
| 5231462 | Optical spectrophotometer with wavelength modulation A spectrophotometer useful for measuring absorption or emission bands of a substance irradiated with optical radiation, comprises a light source for producing the optical radiation, a monochromator for isolating light of wavelength (W) from the optical ra... | 07/27/1993 |
| 5207855 | Apparatus for sticking on stamps from an embossing foil The operation of sticking stamps from a foil in strip form at predetermined locations on a substrate which has motifs printed thereon and which is pulled through at least one sticking station at a predetermined forward feed speed is effected by means of p... | 05/04/1993 |
| 5194750 | High precision ccd magnetic field sensor A magnetic field sensor, having a charge-coupled device formed in a semiconductor region is disclosed. The magnetic field sensor has first and second contact zones, made of a heavily doped semiconductor material of a first conductivity type, located on an... | 03/16/1993 |
| 5153823 | Device to measure and/or control flow-through and/or quantity of heat A device for measuring or controlling a property of a flow medium comprises a conduit which carries a flow medium. A choke element located in the conduit has a first open operating position and a second closed operating position. A driver drives the choke... | 10/06/1992 |
| 5139149 | Apparatus for stacking sheets An apparatus for stacking sheets comprises a belt of predetermined length and an endless belt. The belts pass around fixed axis rollers and three guide rollers which are displaceable for the purpose of varying the belt geometry by means of a carriage. As ... | 08/18/1992 |
| 5140166 | Device for aligning sheets with plural drive roller groups on a common shaft In a sheet feeding device, the local feed of the sheet is measured in the vicinity of respective drive rollers by means of respective sensors for the purpose of aligning rectangular sheets of a preselected set. On the basis of signals from the light senso... | 08/18/1992 |
| 5136514 | Tariff arrangement with secure bidirectional interface A tariff arrangement which is preferably intended for an electricity meter comprises a microprocessor, a data memory and a bidirectional interface for transfer of data with a read-out device. For the duration of a data transfer operation a timing member i... | 08/04/1992 |
| 5130776 | Ultraviolet-light photodiode An ultraviolet-light sensitive photodiode device comprises a first semiconductor photodiode for producing a first current when illuminated by light and a second semiconductor photodiode for producing a second current when illuminated by light. The first a... | 07/14/1992 |
| 5128537 | Device for optically measuring a pressure differential A device for optically measuring a pressure difference in a medium by means of a Fabry-Perot interferometer, comprises a transparent plate and a diaphragm block connected to the transparent plate, the diaphragm block comprising a substrate, a measuring di... | 07/07/1992 |
| 5125753 | Device to measure flow-through and/or quantity of heat A heat circuit comprises an initial conduit containing a flow medium and a return conduit. A choke element located in a conduit such as the initial conduit of a heat circuit serves to control the flow of the flow medium. The choke element has several acti... | 06/30/1992 |
| 5124624 | Arrangement for electrical measurement An arrangement for electrical measurement ascertains "subordinate" quantities, and is also "main" quantities with great accuracy and safety against falsification. An active energy to be measured is a main quantity, and a subordinate quantity is at least o... | 06/23/1992 |
| 5119024 | Optical device for sensing magnetic inductions A device for measuring a magnetic induction comprises an evaluation device including a source for emitting light and a receiver for receiving light. A resonator is located in the light path between the source and the receiver and comprises first and secon... | 06/02/1992 |
| 5116037 | Apparatus for receiving and issuing sheets An apparatus for the fault-free receiving and issue of sheets has guide rollers which are arranged on a carriage and which engage into belts to alter the geometry of the belts when the carriage is displaced on a rail over a stack by means of a drive. In t... | 05/26/1992 |
| 5109767 | Device for the embossing of fine structures A device for embossing a set of motifs having a predetermined motif interval onto a length of film utilizes a rotating embossing cylinder which is provided with a recess for the attachment of an embossing matrix. The embossing matrix has a usable length w... | 05/05/1992 |
| 5106125 | Arrangement to improve forgery protection of credit documents A credit document with improved protection against forgery comprises a film which is attached to a local portion of a surface of the credit document. The film includes at least one security mark. The security mark comprises a micro-relief structure for op... | 04/21/1992 |
| 5104471 | Interlaminar sandwich with diffraction structure An interlaminar sandwich comprises first and second lacquer layers, a diffraction structure embedded between the first and second lacquer layers, a heat activated adhesive layer disposed one one of the lacquer layers, and a transparent stabilization layer... | 04/14/1992 |
| 5076441 | Device for the acceptance and delivery of banknotes and process for its operation A device for accepting, storing, and delivering a predetermined set of banknotes comprises a housing, a deposit opening, a delivery opening, a testing mechanism for determining the denomination of the banknotes, a banknote stockpile for storing the bankno... | 12/31/1991 |
| 5047651 | Arrangement for measuring a deviation from its line of a movable web of foil The arrangement comprises a tracking sensor with a light source, an optical means and a receiver with two photosensitive detectors, as well as a measuring apparatus with a computing unit. The optical means focuses light to provide a beam which falls on a ... | 09/10/1991 |
| 5034616 | Device for optically scanning sheet-like documents For automatic recognition of the authenticity of items in sheet form such as bank notes, for example in an automatic service machine, the transparency of each bank note is examined in predetermined spectral ranges. The measuring system is arranged between... | 07/23/1991 |
| 5032785 | Arrangement for measuring an electrical power or energy In an arrangement for measuring an electrical power or energy, for each of a plurality of phases, the arrangement includes a voltage input in a transformer supplied with current and connected to an integrator with a high ohm input. Each transformer is con... | 07/16/1991 |
| 5032003 | Optially variable surface pattern An article of manufacture including an optically variable surface pattern is disclosed. The optical surface pattern makes visible one out of a plurality of N image representations for each one out of N predetermined viewing directions. The surface pattern... | 07/16/1991 |
| 4993556 | Turning device for sheet-like items and process for its operation A turning device which receives randomly oriented sheet-like items, such as bank notes, and delivers them in a predetermined orientation comprises a testing station which determines the initial orientation of the items, a control device which receives sig... | 02/19/1991 |
| 4910570 | Photo-detector for ultraviolet and process for its production A semiconductor photo-detector is disclosed. The inventive photo-detector is especially sensitive to light in the ultraviolet and/or blue portions of the spectrum. The semiconductor body comprising the detector is arranged with a band structure which, thr... | 03/20/1990 |
