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Class Information
Number: 33/367
Name: Geometrical instruments > Indicator of direction of force traversing natural media > Level or plumb, terrestrial gravitation responsive > Plural, similar, separable liquid columns system
Description: Device including separable, independently movable liquid containers interconnected by a liquid conductor, the upper surfaces of the liquid in the containers establishing a horizontal direction.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 6655036 |
Aid apparatus for level surveying instrument |
Dec. 2, 2003 |
| 6493954 |
Fluid-actuated level device |
Dec. 17, 2002 |
| 6425299 |
Relative height gauge |
Jul. 30, 2002 |
| 6088922 |
Method and apparatus for hydrostatical leveling |
Jul. 18, 2000 |
| 5937529 |
Apparatus for measuring vertical displacement |
Aug. 17, 1999 |
| 5659966 |
Hydrostatic level measuring and survey apparatus |
Aug. 26, 1997 |
| 5617640 |
Level position measuring method, level marking method and level marking apparatus comprising a tube, capable of directly measuring a height |
Apr. 8, 1997 |
| 5459933 |
Level position measuring method and device |
Oct. 24, 1995 |
| 5367782 |
Level marking method and level marking apparatus |
Nov. 29, 1994 |
| 5309645 |
Combination plumb or level and height setting instruments |
May. 10, 1994 |
| 5164708 |
Single unit, multi signal, variable plane measuring and leveling device |
Nov. 17, 1992 |
| 5131156 |
Leveling apparatus and method |
Jul. 21, 1992 |
| 5111588 |
Level vial |
May. 12, 1992 |
| 5101571 |
Hydrostatic plumber's level |
Apr. 7, 1992 |
| 5090128 |
Device for measuring or controlling change of level between several points |
Feb. 25, 1992 |
| 5074049 |
Vial |
Dec. 24, 1991 |
| 5001926 |
Device for determining the vertical distance between two elements at unequal heights |
Mar. 26, 1991 |
| 4991302 |
Open circuit leveling measuring system |
Feb. 12, 1991 |
| 4984791 |
Green inclination level for golfers |
Jan. 15, 1991 |
| 4977680 |
Loft indicator and lie detector for golf club heads |
Dec. 18, 1990 |
| 4976495 |
Method and apparatus for steering a mining machine cutter |
Dec. 11, 1990 |
| 4972596 |
Trailer measuring system |
Nov. 27, 1990 |
| 4947556 |
Plumber's level |
Aug. 14, 1990 |
| 4894924 |
Method for measuring level of large structure |
Jan. 23, 1990 |
| 4794704 |
Height level measuring device |
Jan. 3, 1989 |
| 4773161 |
Portable liquid level |
Sep. 27, 1988 |
| 4769918 |
Level indicating device |
Sep. 13, 1988 |
| 4759134 |
Flexible level |
Jul. 26, 1988 |
| 4691445 |
Horizontal evaluation datum scope |
Sep. 8, 1987 |
| 4686773 |
Structure leveling system |
Aug. 18, 1987 |
| 4669484 |
Automatic leveling device for hemodynamic pressure measuring system |
Jun. 2, 1987 |
| 4651433 |
Pressure sensitive leveling device |
Mar. 24, 1987 |
| 4648185 |
Leveling tool |
Mar. 10, 1987 |
| 4625424 |
Quick leveling apparatus |
Dec. 2, 1986 |
| 4613816 |
Cryogenic magnetic probe having new substrate |
Sep. 23, 1986 |
| 4610094 |
Level |
Sep. 9, 1986 |
| 4603485 |
Leveling apparatus |
Aug. 5, 1986 |
| 4581931 |
Differential level-monitoring float device |
Apr. 15, 1986 |
| 4574491 |
Level with audio indicator |
Mar. 11, 1986 |
| 4567669 |
Blue top setting device |
Feb. 4, 1986 |
| 4563822 |
Level device for masonry work |
Jan. 14, 1986 |
| 4536968 |
Adjustable water level device |
Aug. 27, 1985 |
| 4492037 |
Liquid leveling device |
Jan. 8, 1985 |
| 4434561 |
Level indicator |
Mar. 6, 1984 |
| 4422244 |
Elevation indicator |
Dec. 27, 1983 |
| 4397099 |
Electronic apparatus for measuring the difference of elevation between two points |
Aug. 9, 1983 |
| 4384410 |
Precision hydrostatic levelling system |
May. 24, 1983 |
| 4379367 |
Electrically controlled level |
Apr. 12, 1983 |
| 4356639 |
Compact portable digital multimeter for instantaneous measuring of height differences independently of visibility |
Nov. 2, 1982 |
| 4297791 |
Hose water leveling instrument |
Nov. 3, 1981 |
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