Patent US2790930A successfully refreshed from Google Patents.
US4472078A
Expired / Lapsed
US
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Frame for draining ditches
Assignee: ACO Ahlmann SE and Co KG
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Filing: 1982-12-09
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Granted: 1984-09-18
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Expires: 2002-12-09
Abstract
Abstract A frame formed of metal, for draining ditches, comprising two downward pointing legs extending in parallel spaced relationship forming between them a channel having the material in the upper region of the wall of the ditch formed integrally with it therein said legs being interconnected with each other via a web the upper surface of which forms an abutment area for a ditch covering, and a leg extending upwards from the web for holding the channel covering laterally, with the two lower legs, in particular, being provided with several recesses at the undersides thereof leaving between them projections with the recesses and projections of the one lower leg being respectively arranged to abut at least in part or at least approximately the gaps of the other lower leg.
Inventors
- 👤 Peter Karbstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:45
CPC Classifications
E; E01; E01C; E01C11/00; E01C11/22; E01C11/224; E01C11/227
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
129 words
A frame formed of metal adapted to be cast into an upright leg of draining ditches, comprising two downward pointing legs in parallel spaced arrangement forming between them a channel adapted to receive the cast material of the ditch, said legs being integrally connected with each other via a web, the upper surface of said web forming an abutment area for supporting a ditch covering, and a leg extending upwards from the web in opposition to said downwardly pointed legs for holding the ditch covering laterally, characterized in that both downward legs are provided with several spaced recesses extending only partially therethrough and leaving between them projections with the recesses and projections of one downward leg being staggered in a lengthwise relation to those of the other downward leg.
Claim 2
Dependent Claim
129 words
A frame formed of metal adapted to be cast into an upright leg of draining ditches, comprising two downward pointing legs in parallel spaced arrangement forming between them a channel adapted to receive the cast material of the ditch, said legs being integrally connected with each other via a web, the upper surface of said web forming an abutment area for supporting a ditch covering, and a leg extending upwards from the web in opposition to said downwardly pointed legs for holding the ditch covering laterally, characterized in that both downward legs are provided with several spaced recesses extending only partially therethrough and leaving between them projections with the recesses and projections of one downward leg being staggered in a lengthwise relation to those of the other downward leg.
Claim 3
Dependent Claim
21 words
A frame according to claim 1, characterized in that the length of the recesses approximately equals the length of the projections.
Claim 4
Dependent Claim
21 words
A frame according to claim 2, characterized in that the legs are provided with openings adjacent the recesses and the projections.
Claim 5
Dependent Claim
24 words
A frame according to claim 3, characterized in that the openings adjacent the projections are double the size of the openings adjacent the recesses.
Claim 6
Dependent Claim
23 words
A frame according to claim 4, characterized in that the lower legs are provided with notches at the ends in the lower region.
Claim 7
Dependent Claim
36 words
A frame according to claim 5, characterized in that the abutment web has a section of increased thickness adjacent one end thereof with an interlocking recess formed therein opening towards the inner surface of the channel.
Claim 8
Dependent Claim
24 words
A frame according to claim 6, characterized in that the interlocking recess opens to the opposite side of the frame via a threaded bore.
Claim 9
Dependent Claim
20 words
A frame according to claim 1, characterized in that all the edges facing the material of the ditch are rounded.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-09-18 | 1988-03-19 | 1988-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-18 | 1992-03-19 | 1992-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-18 | 1996-03-19 | 1996-09-18 | $7700.00 | Window Closed / Lapsed |