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(12) Patent: | (11) CA 1231063 |
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(21) Application Number: | 1231063 |
(54) English Title: | BEAVER GUARD FOR DRAINAGE CULVERT |
(54) French Title: | PROTECTION DES PONCEAUX DE DRAINAGE CONTRE LES CASTORS |
Status: | Term Expired - Post Grant |
(51) International Patent Classification (IPC): |
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(72) Inventors : |
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(73) Owners : |
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(71) Applicants : |
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(74) Agent: | |
(74) Associate agent: | |
(45) Issued: | 1988-01-05 |
(22) Filed Date: | 1984-05-17 |
Availability of licence: | Yes |
Dedicated to the Public: | N/A |
(25) Language of filing: | English |
Patent Cooperation Treaty (PCT): | No |
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(30) Application Priority Data: | None |
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"BEAVER GUARD FOR DRAINAGE CULVERT"
ABSTRACT OF THE DISCLOSURE
A guard is provided for placement over the upstream opening
of a culvert, to bar beavers from entering the culvert and to provide a
useful means for dislodging the dam wall which the beavers will build
against the guard.
The guard comprises a flexible grid consisting of longitudinally
extending, spaced apart steel chains, to which are welded a plurality of
transversely extending , spaced apart, rigid steel rods. The width of
the grid is sufficient to extend across the culvert opening and bear
against the culvert side wall; the length of the grid is sufficient so
that it extends along the ground surface in front of the culvert opening,
so as to be positioned beneath the beaver dam wall. Means are provided
at the upper end of the grid, for securing it to the culvert or roadway,
so that the grid remains hung over the opening. A long chain extends
from the lower end of the grid, which chain is always available to be
grasped and which may be attached to a vehicle on the roadway. This
provides a means for rolling up the grid and bringing its load of ac-
cumulated debris onto the roadway for disposal.
Note: Claims are shown in the official language in which they were submitted.
Note: Descriptions are shown in the official language in which they were submitted.
Sorry, the representative drawing for patent document number 1231063 was not found.
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Description | Date |
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Revocation of Agent Requirements Determined Compliant | 2020-09-01 |
Inactive: IPC from MCD | 2006-03-11 |
Inactive: IPC from MCD | 2006-03-11 |
Inactive: Expired (old Act Patent) latest possible expiry date | 2005-01-05 |
Grant by Issuance | 1988-01-05 |
There is no abandonment history.
Note: Records showing the ownership history in alphabetical order.
Current Owners on Record |
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EUGENE G. CRICK |
Past Owners on Record |
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None |