Did You Know...
...When G.G. Hubbard learned of his future son-in-law's invention, he called it "only a toy." His daughter was engaged to a young man named Alexander Graham Bell.
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| Number | Title | Issue Date |
| 7331114 | Magnetic compass structure A simple self-contained, hand-held instrument for reading an azimuth or bearing in relation to the earth's magnetic field either out in the field or on the water with substantial accuracy. Means are provided that places the far object into the same focal plane (or f... | 02/19/2008 |
| 7269985 | Magnifying lens cover for combination padlocks By providing a magnifying member which is securely affixed to the housing of a combination padlock in cooperating association with the rotating dials thereof, an easily produced, combination padlock is achieved which provides a display zone for the pre-set combinati... | 09/18/2007 |
| 7197343 | Portable electronic apparatus with azimuth measuring function, magnetic sensor suitable for the apparatus, and azimuth measuring method for the apparatus A portable phone has a CPU and a magnetic sensor unit including an X-axis magnetic sensor, a Y-axis magnetic sensor, and a temperature sensor. CPU measures at first and second temperatures the influence of a magnetic field of permanent magnets upon an output Sx of t... | 03/27/2007 |
| 6925727 | Dial-display measuring tool and one-revolution dial gauge Since a dial face (3) and an area indicator (4) are formed separately to be independently turnable, the area indicator (4) is not rotated even when the dial face (3) is rotated. With this arrangement, the area indicator (4) can ind... | 08/09/2005 |
| 6094830 | Inclination-compensating display device for a compass The present invention provides a compass comprising an at-least-partially-transparent housing having a top and a bottom, a vertically orientated, conical pivot bearing, and a magnetic detection means which is mounted on the vertically-oriented conical piv... | 08/01/2000 |
| 5560114 | Arrangement for compensating for magnetic declination in an optically readable bearing compass An arrangement for correcting declination in an optically readable bearing compass having a body enclosing a hermetically sealed capsule containing a compass card and a main reading line calibrated indicate bearing to the earth's magnetic pole without cor... | 10/01/1996 |
| 5151753 | Non-parallax optical sighting instrument An optical sighting instrument having a main optical path including an objective lens, an eyepiece lens and a beamsplitter for combining or superimposing images. At least three image planes are defined with reference to the main optical path and the beams... | 09/29/1992 |
| 5046259 | Underwater measuring systems and methods Measuring systems for making underwater measurements of relative positions and distances between a plurality of objects positioned on an ocean or lake floor basically include (a) at least one laser or other light source capable of projecting a collimated ... | 09/10/1991 |
| 4967479 | Position relocation device A relocation device has a housing, a first sight tube having a viewing opening through which a user can look to sight an object substantially along a first line of sight, a second sight tube having a viewing opening through which a user can look to sight ... | 11/06/1990 |
| 4899453 | Compass with LED illumination A magnetic compass is illuminated by a light emitting diode. The compass is nclosed in a case made of a lightweight, plastic composite material. The light-emitting diode is energized by a low profile, nonmagnetic battery connected to the light emitting dio... | 02/13/1990 |
| 4894922 | Hand bearing compass A hand bearing compass comprises an electronic direction finding sensor fixed in a flat rectangular compass body. An actuating button causes the sensor to measure a magnetic bearing in dependence on the orientation of the compass body in a horizontal plan... | 01/23/1990 |
| 4763419 | Optical viewing system There is provided an optical viewing system, which is preferably a compass which eliminates the parallax and sighting problems of prior art optical systems. The compass includes a beam splitter which displays a sighted image both on a reference screen and... | 08/16/1988 |
| 4594788 | Light-tight combination micrographic map-reader protractor compass A movable film cartridge with at least one view superimposed by a protractor image on transparent film is further provided with a compass viewed through a prism at an edge of the field of view of the film containing a map or aerial view image. A double sp... | 06/17/1986 |
| 4438568 | Recreational compass A recreational or sportman's compass is comprised of an inner vial including a compass needle which together with an azimuth ring is resiliently mounted within a housing so as to be rotatable together or independently of one another. The vial is assembled... | 03/27/1984 |
| 4402140 | Telescope with compass Disclosed is a structure of a telescope with compass which indicates the direction in which the telescope is pointed, at the periphery of the field of vision of the telescope. Referring to the compass used for the telescope: a magnet is provided in a comp... | 09/06/1983 |
| 4395828 | Combination geodetic transit compass and signal mirror A geodetic compass having a mirrored cover that has the dual purpose of providing means for reading the compass needle orientation for geodetic purposes, while at the same time having cross hatch diffractional sighting means incorporated in said cover and... | 08/02/1983 |
| 4241511 | Method and apparatus for determining and recording boat compass deviation A method and apparatus for determining and recording boat compass deviation which includes a novel apparatus which may be oriented with respect to either a line of sight bearing or a compass reading and includes means for recording at predetermined annula... | 12/30/1980 |
| 4206842 | Pyramid container device A pyramid container device is disclosed which is adapted for holding an item. The container device comprises a first container member having the substantial shape of a regular pyramid with a substantially square first container base. The first container m... | 06/10/1980 |
| 4158260 | Wrist compass and transit A wrist compass is formed with a base member having straps at each side for strapping to a user's wrist and with a detachable compass body having complementary interengaging surfaces for removably securing the compass body to the base member. The base mem... | 06/19/1979 |
| 4081912 | Magnetic bearing plotting and sighting device A device for taking and plotting magnetic bearings which includes an elongated straight edge device having numerical graduated indicia along one edge thereof, and a housing receiving said straight edge. A magnetic compass is mounted on the straight edge, ... | 04/04/1978 |
| 4020559 | Bearing compass A portable hand-held compass for taking navigational bearings on distant objects during the day or at night. The compass has a hollow housing in which a compass card is mounted for rotation about a vertical axis, a viewing window in the housing through wh... | 05/03/1977 |
