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Patents

Referenced by

Citing PatentFiling dateIssue dateOriginal AssigneeTitle
US396984718 Nov 197420 Jul 1976Benjamin J. CampagnaCombination manhole closure assembly and separate support ring
US399452026 Mar 197530 Nov 1976Pont-A-Mousson S.A.Locking device for roadway manhole cover
US45676978 Dec 19834 Feb 1986Utility vault cover seal
US474760114 May 198731 May 1988Societe Nouvelle d'exploitation de la CalheneDisconnectable sealing device for linking two closed volumes without breaking the confinement
US510971221 Sep 19905 May 1992Precision General, Inc.Portable sample cylinder with reduced seal permeability
US56221176 Jun 199522 Apr 1997Salco Products, Inc.Hatch cover having a removable gasket
US605019927 Mar 199818 Apr 2000Zeftek, Inc.Hatch cover sealing device

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