Multi-ply fibrous sheet structure and its manufacture
Patent 4320162 Issued on March 16, 1982. Estimated Expiration Date: 
May 15, 2000. 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 15, 2000. 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 2854336 3708366 3867225 3868205 InventorAssigneeApplicationNo. 06/149913 filed on 05/15/1980US Classes:428/154, Plural paper components156/209, Surface deformation only (e.g., embossing)156/210, To form undulated to corrugated sheet and securing to base with parts of shaped areas out of contact162/113, With additional deformation162/117, Subsequent treatment by irregular or configured die162/205, Pressure428/156, Including variation in thickness428/166, Interlaminar spaces428/172, Composite web or sheet428/178, Forming, or cooperating to form cells428/184, Plural corrugated components428/212, Including components having same physical characteristic in differing degree428/332Physical dimension specifiedExaminersPrimary: Thibodeau, Paul J.Attorney, Agent or FirmInternational ClassesB31F 1/00 (20060101)B31F 1/07 (20060101) B32B 3/28 (20060101) D21H 27/40 (20060101) D21H 27/30 (20060101) AbstractIn the manufacture of a multi-ply fibrous sheet structure, each of a pair of plies of fibrous web material is provided with a pattern of relatively deep, primary, spot embossments each adherent to the opposite ply and surrounded by a pattern of relatively shallow, secondary, non-adherent spot embossments.Field of SearchPlural paper componentsInterlaminar spaces Forming, or cooperating to form cells With locally deformed crests or intersecting series of corrugations Plural corrugated components Including components having same physical characteristic in differing degree Including variation in thickness Physical dimension specified | |
