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Class Information
Number: 33/289
Name: Geometrical instruments > Straight-line light ray type > Alignment device > Game ball (e.g., football, etc.)
Description: Device comprising means for locating a ball longitudinally of a playing field with reference to a previous location of the ball on the field.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7219438 |
System for operating one or more suspended laser projectors to project a temporary visible image onto a surface |
May. 22, 2007 |
| 7185439 |
System for measuring the position of a ball in a sporting event |
Mar. 6, 2007 |
| 6976928 |
Sports ball spotting apparatus |
Dec. 20, 2005 |
| 6907840 |
Football first down indicator system |
Jun. 21, 2005 |
| 6895677 |
System for operating one or more lasers to project a visible line onto a surface |
May. 24, 2005 |
| 6851199 |
Football measuring device and method |
Feb. 8, 2005 |
| 6851198 |
Superior system and method for determining the position of a first down of a football on a field during a game |
Feb. 8, 2005 |
| 6796041 |
System for operating one or more lasers to project a visible line onto a grass-covered surface |
Sep. 28, 2004 |
| 6778283 |
Method and apparatus for locating a football on a field of play |
Aug. 17, 2004 |
| 6751880 |
System and method for operating groups of lasers to project a visible line of demarcation within discrete regions of an athletic field |
Jun. 22, 2004 |
| 6527647 |
Pool training device |
Mar. 4, 2003 |
| 6350211 |
Baseball pitching aid |
Feb. 26, 2002 |
| RE37519 |
Golf club with optical alignment system |
Jan. 22, 2002 |
| 6045450 |
Billiards table targeting disk |
Apr. 4, 2000 |
| 6024649 |
Accurack |
Feb. 15, 2000 |
| 6012228 |
Color coded football yardage measuring sleeve |
Jan. 11, 2000 |
| 5640777 |
Golf club with optical alignment system |
Jun. 24, 1997 |
| 5214491 |
Apparatus and method for determining the position of a football during a football game |
May. 25, 1993 |
| 5189803 |
Device for measuring the first down in football |
Mar. 2, 1993 |
| 5113589 |
Football exact yard marker and method for use |
May. 19, 1992 |
| 5067245 |
Instant placement down rod |
Nov. 26, 1991 |
| 4333237 |
Apparatus for comparing the distance of two balls from a third ball |
Jun. 8, 1982 |
| 4232450 |
Football yardline locating device |
Nov. 11, 1980 |
| 4178694 |
Point-of-aim indicator |
Dec. 18, 1979 |
| 4090708 |
Apparatus for marking football fields |
May. 23, 1978 |
| 4014117 |
Spectator football visual aid |
Mar. 29, 1977 |
| 3985356 |
Apparatus for locating and positioning a football on a football playing field |
Oct. 12, 1976 |
| 3947026 |
Billiard training device |
Mar. 30, 1976 |
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