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Class Information
Number: 297/301.1
Name: Chairs and seats > Back movement resiliently opposed in operating position > Back adjusts independent of seat
Description: Opposed back movement wherein the elastic member opposes movement of the upright support independent of the bottom.










Sub-classes under this class:

Class Number Class Name Patents
297/301.4 Coil spring 50
297/301.2 Fluid-spring 34
297/301.5 Including back movement limiting device 44
297/301.3 Torsion bar or torsion spring 55


Patents under this class:
1 2

Patent Number Title Of Patent Date Issued
8616641 Therapeutic back support and stabilization Dec. 31, 2013
8613481 Chair Dec. 24, 2013
8602494 Pivoting task chair Dec. 10, 2013
8544957 Chair Oct. 1, 2013
8465095 Chair with tiltable back Jun. 18, 2013
8408647 Movable chair backrest Apr. 2, 2013
8282166 Chair with tiltable backrest Oct. 9, 2012
8113586 Apparatus for adjusting the seat back angle Feb. 14, 2012
8070232 Scooter with dual chair backs Dec. 6, 2011
8002351 Support member Aug. 23, 2011
7971935 Ergonomic side chair Jul. 5, 2011
7946651 Mechanism for adjusting the inclination of backrests in chairs and arm-chairs, particularly in office chairs May. 24, 2011
7862120 Chair Jan. 4, 2011
7823976 Chair Nov. 2, 2010
7775601 Back structure for a chair Aug. 17, 2010
7686395 Chair with deformable backrest Mar. 30, 2010
7665805 Chair Feb. 23, 2010
7614697 Coupling mechanism interposed between a seat and a back of a chair to prevent a reclining motion of the back from tilting the seat Nov. 10, 2009
7494185 J-back adjustment mechanism Feb. 24, 2009
7425037 Tilt chair and methods for the use thereof Sep. 16, 2008
7416252 Backpost unit of wooden dining chair with reclining mechanism Aug. 26, 2008
7249801 Cushioning device to cushion the backrest of a chair, an armchair, an office chair or similar Jul. 31, 2007
7234775 Dynamically balanced seat assembly having independently and arcuately movable seat and backrest and method Jun. 26, 2007
7185951 Chair and synchrotilt chair mechanism Mar. 6, 2007
7147285 Reclining apparatus for chair Dec. 12, 2006
7147286 Versatile chair Dec. 12, 2006
7147288 Backrest Dec. 12, 2006
7134722 Chair Nov. 14, 2006
7118177 Chair with tiltable backrest Oct. 10, 2006
7021712 Chair with flexible, resilient back support Apr. 4, 2006
6913316 Chair Jul. 5, 2005
6820934 Chair having flexible back support Nov. 23, 2004
6679551 Stackable chair with flexible back support Jan. 20, 2004
6672669 Swingable chair back with top pivot Jan. 6, 2004
6669294 Chair Dec. 30, 2003
6612652 Theater seat assembly Sep. 2, 2003
6588844 Chair wit tiltable seat Jul. 8, 2003
6588843 Chair control Jul. 8, 2003
6568760 Chair of modular construction May. 27, 2003
6565153 Upper back support for a seat May. 20, 2003
6471293 Stackable chair with flexible back support Oct. 29, 2002
6435615 Seating furniture with downwardly movable, pivoting backrest Aug. 20, 2002
6367877 Back for seating unit Apr. 9, 2002
6322144 Seat support for revolving chairs Nov. 27, 2001
6196632 Chair, especially an office chair Mar. 6, 2001
6193314 Office chair with adjustable backrest and adjustable seat Feb. 27, 2001
6149236 Chair frame, control mechanism and upholstery Nov. 21, 2000
6116687 Functional chair Sep. 12, 2000
6024410 Double-sided reclining apparatus Feb. 15, 2000
5957533 Articulated reclining backrest with lumbar support Sep. 28, 1999

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