Golf trainer
Patent 5133556 Issued on July 28, 1992. Estimated Expiration Date: 
March 11, 2011. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
March 11, 2011. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesGolf ball including alignment markings and golf ball marking device Patent #: 4441716 InventorApplicationNo. 667496 filed on 03/11/1991US Classes:473/218, Foot positioning aid and indicator associated with swingable implement33/508, Golf stance, swing or club analysis473/257, Swingable implement swing path indicator473/268, Sighting device directing golfer`s visual focus toward a point to restrain head movement473/270, Foot positioning aid473/280, Practice projectile473/351BallExaminersPrimary: Marlo, George J.Attorney, Agent or FirmForeign Patent References
International ClassA63B 069/36Foreign Application Priority Data1990-03-12 AUAbstractAn orientation apparatus includes a device including a semi-spherical cap adapted for placement on a golf ball. The device defines a reference plane and has a window permitting meridional markings on the golf ball or the device to be viewed and to be aligned relative to the reference plane. The device is provided with a spirit level and a directional indicator for alignment of the markings with an intended direction of play. | |
