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| Number | Title | Issue Date |
| 4404750 | Needlepoint sheet A needlepoint sheet of flexible plastic material having a plurality of aligned rows of perforations for receiving thread-like material such as yarn therethrough. The sheet has at least one flat face which has pattern indicia imprinted directly on the flat... | 09/20/1983 |
| 4351045 | Tracking error measurement Method and apparatus for obtaining a measure of or relating to lateral tracking error at each of a plurality of predetermined radial distances from the spindle axis of phonographic turntable equipment that includes a spindle (13), a rotatable platter (14)... | 09/21/1982 |
| 4336653 | English unit to metric unit conversion device A conversion chart having a transparent base sheet with a first series of divergent solid lines and a second series of divergent broken lines, with the first and second series of lines having a common base line. The first series of divergent lines are spa... | 06/29/1982 |
| 4271596 | Instrument and method for determining map coordinates An instrument and method is provided for accurately determining the geographic coordinates of a specific location on a map. The instrument comprises a flat transparent plastic sheet having a variable length scale printed thereon which is defined by a plur... | 06/09/1981 |
| 4221057 | Printers gauge This invention relates to a device for counting typographical characters on a page of typed material. The disclosed invention includes a transparent first member which may be oriented along a line of typographical characters. A transparent second member i... | 09/09/1980 |
| 4171573 | Cropping guide A cropping guide especially for drawing a proportioned field for use in audio/visual work has three straight edge marking device guides, each with an index associated therewith. The first and second straight edges define a right angle therebetween and the... | 10/23/1979 |
| 4129947 | Gauge and method for determining the number of words per printed page A gauge is provided for measuring the width of a selected word, for example "the", and using this width to determine the number of words per line on a printed page. The same gauge, in one embodiment of the invention, also includes means for determining th... | 12/19/1978 |
| 4102049 | Grip measuring device A device for measuring the grip size of a human hand to determine the proper size of a sporting implement handle such as found on a tennis racket or the like, the device comprising a rigid, transparent planar surface, said surface having indicia disposed ... | 07/25/1978 |
| 4021923 | Metric unit conversion aid A template incorporating a plurality of openings forming columns and rows having a predetermined alignment and identified by annotations representing metric system units to facilitate use of the device for automatic unit conversion during the performance ... | 05/10/1977 |
