U.S. patents available from 1976 to present.
U.S. patent applications available from 2005 to present.

Paving stone with lateral spacers

Patent 5503498 Issued on April 2, 1996. Estimated Expiration Date: Icon_subject December 23, 2014. 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

3494266

Paving block Patent #: 5267810
Issued on: 12/07/1993
Inventor: Johnson

Inventor

Application

No. 360774 filed on 12/23/1994

US Classes:

404/34, Modules or blocks (preformed)52/596, OPAQUE STONELIKE MODULE52/603, With integral spacing projections404/37, Including spacer means404/41Interfitting

Examiners

Primary: Britts, Ramon S.
Assistant: O'Connor, Pamela A.

Attorney, Agent or Firm

Foreign Patent References

  • 0060961 EP. 05/13/1984
  • 0227144 EP. 07/13/1987
  • 2610735 DE. 09/13/1977
  • 8302622 DE. 06/13/1983
  • 3116540 DE. 09/13/1983
  • 8700821 DE. 06/13/1987
  • 8901920 DE. 07/13/1989
  • 3804760 DE. 08/13/1989
  • 8913734 DE. 10/13/1990
  • 8913777 DE. 10/13/1990
  • 9000928 DE. 10/13/1990
  • 5112903 JP. 05/13/1993

International Class

E01C 005/00

Foreign Application Priority Data

1993-04-23 DE

Abstract

A paving stone configured to be arranged in a paving stone bond in an area-covering grid-shaped lattice of paving stones comprised of lattice elements. The paving stone has side walls and includes a plurality of spacers disposed on the side walls thereof. Each of the spacers has an abutting surface adapted to be positively joined to a respective abutting surface of a spacer on an adjacent paving stone in the lattice of paving stones. In this manner, a crossing joint is formed between the paving stones. The abutting surface of each of the spacers includes a stepped contour for positively meshing with a corresponding stepped contour on the respective abutting surface of the spacer on the adjacent paving stone, the plurality of spacers being disposed on the side walls of the paving stone such that the stepped contours of their respective abutting surfaces are identically oriented in either of two rotational directions defined around the side walls of the paving stone.

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