Anti-skid device for vehicles
Patent 4133481 Issued on January 9, 1979. Estimated Expiration Date: 
December 19, 1997. 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.
December 19, 1997. 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 References 3672422 3836075 InventorApplicationNo. 05/861530 filed on 12/19/1977US Classes:238/14, Traction mats428/131, Including aperture428/167, Parallel ribs and/or grooves428/169, Oblique to longitudinal axis of web or sheet428/172, Composite web or sheet428/179, Aligned or parallel nonplanarities428/180Waffle-formExaminersPrimary: Lesmes, George F.Assistant: Thibodeau, P. Attorney, Agent or FirmInternational ClassesB60B 39/12 (20060101)B60B 39/00 (20060101) AbstractA traction device comprising a mat made of molded thermo-plastic material having a generally rectangular frame, a traction area and an approach area on each side of the traction area. The traction area occupies approximately half of the length of the mat and the approach areas are made of bars extending generally parallel to the sides of the mat and perpendicular to each other defining rectangular areas. The traction area is made of bars arranged at approximately 45° angles to the sides of the frame and intersecting each other at approximately right angles. The bars are generally T-shaped. The vertical bar of the T is generally elliptical and the horizontal bar is generally elliptical with a flat top surface. | |
