Shock-absorbing system for protective equipment
Patent 4023213 Issued on May 17, 1977. Estimated Expiration Date: 
May 17, 1994. 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.
May 17, 1994. 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 3039109 3609764 3761959 3849801 InventorApplicationNo. 05/686725 filed on 05/17/1976US Classes:2/413, By fluid-containing cushion2/909Head protector (e.g., helmet, goggles, etc.)ExaminersPrimary: Guest, Alfred R.Attorney, Agent or FirmAbstractA shock-absorbing system is provided for protective helmets such as football helmets or crash helmets which includes an impact-resistant shell, a plurality of webs secured to the inside of the shell in the crown portion, and a plurality of flexible plastic compartments containing foam secured to the webs, the compartments being interconnected by means of orifices of relatively small size and the interior of the compartments being at atmospheric pressure or slightly above. | |
