Patent US3943589A successfully refreshed from Google Patents.
US3943589A
Expired / Lapsed
US
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Gangway element
Assignee: Individual
•
Filing: 1974-11-05
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Granted: 1976-03-16
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Expires: 1994-11-05
Abstract
Abstract A skid-proof gangway element in the form of a metal sheet having large holes with upwardly pressed edges and small holes arranged between the large holes and having downwardly pressed edges. The sheet material between the large holes is inclined toward the small holes so as to allow oil to be drained off. The upwardly pressed edges of the large holes provide skid-proof zones.
Inventors
- 👤 Peder Fahrsen Pedersen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:42
CPC Classifications
E; E01; E01D; E01D19/00; E01D19/12; E01D19/125; E01C; E01C5/00; E01C5/16; E04; E04F; E04F15/00; E04F15/02; E04F15/06; E01D2101/00; E01D2101/30; Y; Y02; Y02A; Y02A30/00; Y02A30/60
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
131 words
A gangway element of improved skid-proof properties, comprising a metal sheet having rows of large holes and small holes alternately, the size of the large holes being less than the width of the shoe of a person walking on said gangway, the holes in adjacent rows being out of registry so that each large hole is in alignment with a small hole of the adjacent rows, the edges of the large holes and the small holes being oblique with respect to the plane of the sheet, the edges of the large holes being pressed upwardly, the edges of the small holes being pressed downwardly, the edges of the larger holes merging with the edges of the small holes, whereby all the portions between the holes are inclined towards the small holes.
Claim 2
Dependent Claim
131 words
A gangway element of improved skid-proof properties, comprising a metal sheet having rows of large holes and small holes alternately, the size of the large holes being less than the width of the shoe of a person walking on said gangway, the holes in adjacent rows being out of registry so that each large hole is in alignment with a small hole of the adjacent rows, the edges of the large holes and the small holes being oblique with respect to the plane of the sheet, the edges of the large holes being pressed upwardly, the edges of the small holes being pressed downwardly, the edges of the larger holes merging with the edges of the small holes, whereby all the portions between the holes are inclined towards the small holes.
Claim 3
Dependent Claim
15 words
A plurality of elements according to claim 1 fastened to each other by conventional means.
Claim 4
Dependent Claim
17 words
A plurality of elements according to claim 1 arranged side by side and connected by spacing members.
Claim 5
Dependent Claim
19 words
A gangway element as claimed in claim 1 wherein the large holes and the small holes are substantially circular.
Claim 6
Dependent Claim
50 words
A gangway element as claimed in claim 1 wherein the centers of the large holes are placed at the vertices and at the intersections of the diagonals of rectangles arranged in a pattern, the centers of the small holes being placed at the centers of the sides of the rectangles.
Claim 7
Dependent Claim
34 words
A gangway element as claimed in claim 1 wherein the metal sheet is formed as a channel the holes being formed in the largest flange of the channel that serves as a walking surface.
Claim 8
Dependent Claim
19 words
A gangway element as claimed in claim 6 wherein the channel section has the form of an inverted U.
References Cited (Backward Citations)
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Cited
US2326963A
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US2421171A
Cited
US2781703A
Cited
US3093216A
Cited
US3181440A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-16 | 1979-09-15 | 1980-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-16 | 1983-09-15 | 1984-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-16 | 1987-09-15 | 1988-03-16 | $7700.00 | Window Closed / Lapsed |