Patents by Inventor Erwin Doerr

Erwin Doerr has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 4681252
    Abstract: A can carton having interconnected top, bottom and side walls and end closure panels is provided with a transverse flap formed in the top wall and including spaced parallel side edges and arcuate end slits interconnecting adjacent side edges of the flap, one of the side edges of the flap being defined by a perforated severance line and the other side edge of the flap being defined by a fold line together with stress relieving slits formed in the top and side walls which extend from each arcuate slit into the adjacent side wall. The point of intersection of the stress relieving slit in each side wall with the junction between each side and top wall is offset longitudinally from the severance line defining a side edge of the handle flap. According to a feature of the invention in one form each side edge of the handle flap may be defined by a perforated line which may function as a severance line or as a fold line.
    Type: Grant
    Filed: May 15, 1986
    Date of Patent: July 21, 1987
    Assignee: The Mead Corporation
    Inventors: Erwin Doerr, Prentice J. Wood
  • Patent number: 4653686
    Abstract: A can carton having interconnected top, bottom and side walls and end closure panels is provided with a perforated transverse slit extending completely across one carton wall and having end projections extending into the two carton walls interconnected therewith together with a pair of transverse handle flaps struck from the top carton wall or from the top carton wall and from the side walls interconnected therewith and foldably joined respectively thereto by arcuate transverse fold lines.
    Type: Grant
    Filed: April 14, 1986
    Date of Patent: March 31, 1987
    Assignee: The Mead Corporation
    Inventors: Prentice J. Wood, Erwin Doerr
  • Patent number: 4107160
    Abstract: A process for the continuous recovery of caprolactam from either solid polycaprolactam waste by depolymerization or from liquid polycaprolactam extraction water from an extraction zone where, in either instance, a caprolactam water vapor mixture is produced and subsequently upgraded in a distillation zone to provide a dilute mixture of caprolactam and water vapor. A minor portion of this dilute caprolactam water vapor is condensed and recycled to the distillation zone. The remaining, major portion of this mixture is compressed and admixed with fresh steam, superheated and passed to either the extraction zone or depolymerization reaction.
    Type: Grant
    Filed: August 24, 1977
    Date of Patent: August 15, 1978
    Assignee: Zimmer Aktiengesellschaft
    Inventors: Ovidiu Dicoi, Erwin Doerr
  • Patent number: RE33110
    Abstract: A can carton having interconnected top, bottom and side walls and end closure panels is provided with a perforated transverse slit extending completely across one carton wall and having end projections extending into the two carton walls interconnected therewith together with a pair of transverse handle flaps struck from the top carton wall or from the top carton wall and from the side walls interconnected therewith and foldably joined respectively thereto by arcuate transverse fold lines.
    Type: Grant
    Filed: August 15, 1988
    Date of Patent: November 14, 1989
    Assignee: The Mead Corporation
    Inventors: Prentice J. Wood, Erwin Doerr