Ergonomic chair
Patent 4316632 Issued on February 23, 1982. Estimated Expiration Date: 
August 22, 1999. 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.
August 22, 1999. 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 158869 1778024 2334618 2424753 2711211 3544159 3826456 Chair with adjustable back Patent #: 4007962 InventorAssigneeApplicationNo. 06/068850 filed on 08/22/1979US Classes:297/291, Spring centers back on pivot248/609, Elastomeric248/634Nonmetallic resilient elementExaminersPrimary: Zugel, Francis K.Attorney, Agent or FirmInternational ClassesA47C 7/46 (20060101)A47C 3/12 (20060101) A47C 3/00 (20060101) Foreign Application Priority Data1978-09-08 CHAbstractIn order to achieve the necessary flexible curve according to the natural curve of the human spine in the field of back supports, the back support, attached relatively rigidly in its lower section to the seat, is constructed increasingly more flexibly towards the top. So that the desired course of the spine-like curve can also be achieved at the upper end of the shoulder pad connected to the back rest when the chair is "loaded", a spring member which becomes progressively "harder" is mounted in the connecting element between the end of the back rest and the shoulder pad. | |
