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| Number | Title | Issue Date |
| 7307798 | Multi-step locking eye cup twist up device The present invention is a Twist Up device that consists of multiple pin-movement sections and pin-stopping sections. The pin-movement sections have Twist Up adjustment grooves in multiple steps, and these adjustment grooves allow the Twist Up ring to move the Twist... | 12/11/2007 |
| 6647633 | Low profile compass with removable protective cover and magnetic bull's eye alignment system A low profile compass of the type including a transparent base member and fluid-filled vial contains a directional indicator in the vial in the form of a circle which is alignable with another circle imprinted on the vial. A hinged cover assembly can be d... | 11/18/2003 |
| 6516526 | Pocket transit A transport for measuring strikes and dips. The transport includes a locking mechanism for locking the needle assembly n place. The needle assembly can be momentarily released to allow a measurement to be made, and then locked to allow the measurement to ... | 02/11/2003 |
| 6357128 | Low profile compass with removable protective cover and magnetic bull's eye alignment system A low profile compass of the type including a transparent base member and fluid-filled vial contains a directional indicator in the vial in the form of a circle which is alignable with another circle imprinted on the vial. A hinged cover assembly can be d... | 03/19/2002 |
| 6282802 | Hand-held needleless compass A multi-function, hand-held compass is made up of a base member having a compass vial at one end and a socket at the opposite end to releasably attach to a clip. A lateral depression is formed in the base member to facilitate gripping of the compass, and ... | 09/04/2001 |
| 6126008 | Interactive packaging Packaging for products having at least one movable component, such as navigational compasses and binoculars, to allow a customer to try the packaged product prior to purchase. The packaging provides accessibility to the movable components by the customer.... | 10/03/2000 |
| 6095328 | Carrying case for binoculars A carrying case for binoculars which protects the binoculars during use without interfering with the user's operation of the binoculars. The carrying case comprises a tubular-shaped main body formed from a stretchable and resilient material which is norma... | 08/01/2000 |
| 6088174 | Lens cap apparatus for optical instrument A lens cap apparatus for an optical instrument adapted to shield a user's eyes from incident light from any direction. The lens cap apparatus is formed from an annular base with a pivotally connected lid and a connecting assembly for releasably securing t... | 07/11/2000 |
| 5616903 | Electronic rangefinder apparatus A rangefinder for scopes and binoculars in which a transparent display has a scale or other height-determining member to determine the height of the object viewed through the display and compare with a known object height selectively displayed on the same... | 04/01/1997 |
| 5079846 | Floating disk compass A liquid-type compass comprises a light-weight thin, flat disk of magnetic material so constructed that it is capable of floating on a liquid surface so as to be movable to orient itself in a North-South direction. A flat support provided for storing the ... | 01/14/1992 |
| 4700490 | Compass A compass which is self-compensating for dip of its pointer arms irrespective of variances in the earth's magnetic forces at different geographical locations includes a magnet disposed beneath respective proximal portions of the pointer arms so that the p... | 10/20/1987 |
| 4564909 | Error sensing system for vessels with absolute zero referencing An error sensing system for use in marine autopilot systems of the type having a photographic film compass disk aligned with the direction North and sensing means associated with the disk is operative to sense relative movement between the disk and the se... | 01/14/1986 |
| 4542464 | Autopilot system Apparatus for steering a vessel and maintaining it on a preset course through the combination and arrangement of an incremental encoder and a heading reference circuit is disclosed. The encoder includes circuitry operative to generate a directional signal... | 09/17/1985 |
| 4464843 | Angular measurement apparatus with referencing system A pair of referencing coils are mounted in direct association with a rotatable scale having a reference position index and a code strip. A reference position sensor generates a signal in response to alignment of the reference position sensor with the refe... | 08/14/1984 |
| 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 |
| 4381610 | Self-contained downhole compass A self-contained compass apparatus includes a sensing circuit and power source which are enclosed along with a compass unit within a chamber which is adaptable for suspension at extended distances into a borehole, such as, an oil well, so as to assist in ... | 05/03/1983 |
| 4221328 | Data read-out system and apparatus useful for angular measurements Data acquired from a source such as a coded disc is processed so as to be free of ambiguities associated with boundary transitions where the data source produces groups of bits which have least significant ordering and higher significant ordering. Whereve... | 09/09/1980 |
| 4175333 | Magnetic compass A magnetic compass has been devised which is of the type having a pivot point displaced above the plane of the permanent magnets so that the distance of displacement of the pivot point with respect to the center of force will reduce the tilt angle or tipp... | 11/27/1979 |
| 4154000 | Remote level sensing instrument Concentrated light beams from two or more sources are passed through a spirit level mounted in a portable housing and the presence of the light beam columns after passing through the level is detected to indicate on-level or the direction of off-level for... | 05/15/1979 |
| 4101882 | Data read-out system and apparatus useful for angular measurements Data acquired from a source such as a coded disc is processed so as to be free of ambiguities associated with boundary transitions where the data source produces groups of bits which have least significant ordering and higher significant ordering. Whereve... | 07/18/1978 |
| 4095348 | Digital compass A hand-held digital compass employs an incremental encoder including a digit code disc and sensor unit which are so interrelated with a logic circuit as to permit automatic referencing of the compass when power is initially applied; and further permits us... | 06/20/1978 |
| 3999064 | Angular displacement measuring apparatus with strobe means Cell boundary ambiguities associated with data read from tracks of sequential cells from a data source such as a coded disc are avoided by incorporating specially coded cells in each track and sensing the status of these cells to determine the proper timi... | 12/21/1976 |
| 3950859 | Angular displacement measuring apparatus Angular displacements are measured relative to either an external magnetic field as in a compass or relative to a vertical reference as in inclinometers or the like by selective orientation of the device. A bistable weight balancing apparatus and a dual b... | 04/20/1976 |
