https://www.datamp.org/ Recently added patents en-us https://www.datamp.org/patents/displayPatent.php?id=85337&pn=D332,227 Digital Multimeter Patentee: Steven T. Kaneko - Seattle, King County WA Granted:1993-01-05
Manufactured by John Fluke Mfg. Co. - Everett, Snohomish County WA
Assigned to John Fluke Mfg. Co. - Everett, Snohomish County WA

Description: FIG. 1 is a front elevational view of a digital multimeter showing my new design; FIG. 2 is a right side elevational view, the left side elevational view being a mirror image; FIG. 3 is a top plan view; FIG. 4 is a bottom plan view; and, FIG. 5 is a rear elevational view thereof. Claims: The ornamental design for a digital multimeter, as shown.
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]]> https://www.datamp.org/patents/displayPatent.php?id=85336&pn=5,097,196 Zero-voltage-switched Multiresonant DC To DC Converter Patentee: George K. Schoneman - Cedar Rapids, Linn County IA Granted:1992-03-17
Manufactured by John Fluke Mfg. Co. - Everett, Snohomish County WA
Assigned to Rockwell International Corp. - El Segundo, Los Angeles County CA

Abstract: A multiresonant DC to DC converter which operates at a substantially fixed frequency yet maintains relatively constant efficiency levels despite wide variations in input voltage. The multiresonant converter includes a first transistor switch in series with the DC voltage supply source and the load and a second transistor switch in parallel with the DC voltage supply source and the load. The switching action of the first transistor switch is controlled as a function of the supply voltage input to the converter while the duty factor of the second transistor switch is controlled in accordance with the output voltage of the converter. Claim: A zero-voltage-switched multiresonant converter for generating a regulated DC output voltage for supply to a load from a DC input voltage provided by a DC voltage source, comprising: a first transistor switch connected in series with said DC voltage source and said load; a second transistor switch connected in parallel with said DC voltage source and said load; a first capacitor connected in parallel with said first transistor switch; a second capacitor connected in parallel with said second transistor switch; a first inductor connected in series with said DC voltage source, said load and both of said first and second transistors switches; means coupled to the gate of said first transistor switch for controlling switching of said first transistor switch as a function of the input voltage provided by said voltage source to said converter for stabilizing the current through said first inductor; and means coupled to the gate of said second transistor switch for controlling switching of said second transistor switch as a function of the output voltage of said converter.
This is one of 84,634 patents currently in the database at datamp.org

]]> https://www.datamp.org/patents/displayPatent.php?id=85335&pn=5,432,706 Multimeter Having Min/max Time Stamp Patentees: Glen A. Meldrum - Mountlake Terrace, Snohomish County WA , Alan W. McRobert - Kirkland, King Count WA , Robert M. Grennberg - Marysville, Snohomish County WA Granted:1995-07-11
Manufactured by John Fluke Mfg. Co. - Everett, Snohomish County WA
Assigned to John Fluke Mfg. Co. - Everett, Snohomish County WA

This is a continuation of application Ser. No. 07/666,354 filed Mar. 8, 1991 and now abandoned. Abstract: A min/max time stamp for a multimeter provides display of minimum and maximum measured values recorded since enabling a min/max function. The minimum and maximum values, as well as a present value, may be displayed, together with the relative or absolute time at which the measured minimum or maximum occurred. An alert signal is generated to indicate a new maximum or a new minimum measurement. Claim: A measurement device comprising: measurement means for acquiring a signal and for producing a first digital measurement value representative of the signal; microprocessor means receiving said first measurement value from an output of said measurement means, said microprocessor means operating according to a program adapted to compare said first value with a stored second value representative of a maximum and to replace said stored second value with said first value if said first value represents a maximum relative to said second value, said program also being adapted to compare said first value with a stored third value representative of a minimum and to replace said stored third value with said first value if said first value represents a minimum relative to said third value, said program being further adapted to store a fourth value representative of the time at which said first value that replaced said second stored value was acquired by said measurement means, and to store a fifth value representative of the time at which said first value that replaced said third stored value was acquired by said measurement means; and alert means, said alert means being responsive to a signal supplied by said microprocessor means for indicating that said second value has been replaced with said first value and for indicating that said third value has been replaced with said first value, wherein said program is adapted to direct said microprocessor means to supply a signal to said alert means if said second value has been replaced with said first value or if said third value has been replaced with said first value.
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]]> https://www.datamp.org/patents/displayPatent.php?id=85334&pn=42,296 PIPE WRENCH Patentee: Gustav Gunnarson - San Francisco CA Granted:1893-03-14

The size and position of the teeth on the three jaw faces is based on a formula such that tooth size increases as pipe diameter increases. The principle is shown applied to "hook jaw" and "pliers" type pipe wrenches. Corresponding U.S. patent 460,230 was granted Sept. 29, 1891.
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]]> https://www.datamp.org/patents/displayPatent.php?id=85333&pn=RE12,738 Pipe Wrench Patentee: Ebenezer Fisher - Philadelphia PA Granted:1906-01-23
Assigned to Fisher Wrench Co. - Egg Harbor NJ

Reissue of 773,933, a "girth grip" type pipe wrench with provisions for adapting grip to allow for small variations in pipe sizes or irregular surfaces. Secondary evidence shows Fisher Wrench Co. operated ca. 1903 - 1911, and likely produced a form of this "friction wrench." Corresponding Canadian patent CA-98,248 shows variant forms for some of the component parts.
This is one of 84,634 patents currently in the database at datamp.org

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