Plastic Dowel

Patent No. EP4421332 (titled "Plastic Dowel") was filed by Fischerwerke on Feb 1, 2024. The application was issued on Sep 10, 2025.

Patent Summary

A plastic expansion dowel (1) extends along a longitudinal axis (L), comprising a front nut section (3), a rear head section (2), and an intermediate expansion section (4). It consists of a first base body (5) of a first plastic and a second base body (6) of a second plastic. The first base body forms the head and nut sections and includes at least two expansion bodies (8) separated by slots (7) connected to the head and nut sections. The second base body features at least two circumferentially spaced spreading arms (9) extending as cantilevers parallel to axis (L), connected to a connecting element (10). These spreading arms are connected at their rear ends (11) to the head section (2).

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Patent oppositions filed by competitors challenge the validity of a granted patent. These oppositions are typically based on claims of prior art, lack of novelty, or non-obviousness. They are a key part of the process for determining a patent's strength and enforceability.

CompanyOpposition DateRepresentative
ADOLF WURTHFeb 9, 2026DILG

Dossier Documents

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EP4421332

FISCHERWERKE
Application Number
EP24155157A
Filing Date
Feb 1, 2024
Status
Granted And Under Opposition
Aug 8, 2025
Publication Date
Sep 10, 2025