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Class Information
Number: D18/9
Name: Printing and office machinery > Typewriter or calculator > Calculator (3) > Slide rule type
Description: Design for device consisting of two logarithmically scaled rules mounted to slide along each other so that multiplication, division, and other more complex computations are reduced to the mechanical equivalent of addition or subtraction.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| D597591 |
Dosage calculator |
Aug. 4, 2009 |
| D573175 |
Four-in-one pain scale |
Jul. 15, 2008 |
| D561821 |
Four-in-one pain scale |
Feb. 12, 2008 |
| 5717193 |
Method and apparatus for determining the exponential powers of "i" |
Feb. 10, 1998 |
| D383774 |
Manual calculator |
Sep. 16, 1997 |
| 5569896 |
Method and apparatus for determining the exponential powers of "i" |
Oct. 29, 1996 |
| D316868 |
Slide calculator |
May. 14, 1991 |
| D308884 |
Growth ruler or the like |
Jun. 26, 1990 |
| D289058 |
Refrigeration line size calculator |
Mar. 31, 1987 |
| D284088 |
Nomograph |
Jun. 3, 1986 |
| D277871 |
Conversion calculator |
Mar. 5, 1985 |
| D267957 |
Electrocardiogram analyzer |
Feb. 15, 1983 |
| D265565 |
Electrocardiogram analyzer |
Jul. 27, 1982 |
| D265209 |
Slide calculator for metal beam dimensions |
Jun. 29, 1982 |
| 4308450 |
Two-piece slide calculator for determining metabolic requirements and parenteral feeding dosages |
Dec. 29, 1981 |
| D255784 |
Multiple scale rule |
Jul. 8, 1980 |
| D254078 |
Slide frame for calculator or the like |
Jan. 29, 1980 |
| D253830 |
Slide chart |
Jan. 1, 1980 |
| D253115 |
Metric converter slide rule |
Oct. 9, 1979 |
| D253114 |
Metric converter slide rule |
Oct. 9, 1979 |
| 4149330 |
Digital instant schedule computer |
Apr. 17, 1979 |
| 4132348 |
Slide calculator and method |
Jan. 2, 1979 |
| D249531 |
Jacket for a combined photo calculator and digital ruler |
Sep. 19, 1978 |
| 4028529 |
Currency exchange calculator |
Jun. 7, 1977 |
| D243389 |
Plastic binding size selector |
Feb. 15, 1977 |
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