Did You Know...
...Chester Carlson was a patent agent who tired of having to make multiple copies of patent applications using the only duplication method available at the time: carbon paper. In 1959 he came up with a new copying system and took it to IBM for evaluation. The "experts" at IBM determined potential sales to be only 5,000 units because people wouldn't want to use a bulky machine when they had carbon paper. Carlson's invention was the xerography process, the company founded on the system is Xerox.
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| Number | Title | Issue Date |
| 4035165 | Rapper monitor An apparatus and method for monitoring electrode rapper operation in an electrostatic precipitator. The actual movement or impact of the hammer in an electrode rapper is sensed and a control signal is generated and transmitted to a monitor in response the... | 07/12/1977 |
| 4024768 | Determination of particle sizes The average particle diameter and particle size distribution of hard particles in a bed are determined by causing impingement of the particles, e.g. by tumbling them, and recording and analyzing the beat pattern of the sound emanating from the particles a... | 05/24/1977 |
| 4020298 | Apparatus for testing acoustical attenuation of hearing protectors A portable device primarily for use in determining the effectiveness of various personal hearing protectors in attenuating hazardous noise. The device comprises an electronic circuit for generating audio test signals at varying amplitude levels, and a dis... | 04/26/1977 |
| 3968334 | Audiometric method and apparatus for testing the effectiveness of hearing protective devices A novel method and apparatus is disclosed for audiometrically testing the effectiveness and fitting of insert-type hearing protective devices whereby each ear is enclosed in a separate and portable audiometric enclosure having a telephonic earphone arrang... | 07/06/1976 |
| 3968472 | Vibration detection and analysis system employing an intrinsic safety barrier An intrinsic safety barrier for use in combination with electromagnetic transducers which are intended to generate alternating current signals in hazardous zones and to transmit such alternating signals out of the hazardous zone to remote signal-responsiv... | 07/06/1976 |
| 3954015 | Method of determining piezoelectric constants of ceramic rings A method of ascertaining the piezoelectric constants (d31, d33, sub.31, and g33) of ceramic cylindrical shells (rings) used as the active elements in hydrophones and sound sources to insure quality control. These constants... | 05/04/1976 |
| 3933032 | Dynamic rheometer The dynamic mechanical properties of polymeric materials can be measured either in uniaxial compression or in flexure as a function of frequency over a wide frequency as well as temperature range, by using a piezoelectric driver to apply a displacement to... | 01/20/1976 |
