Patent US4079476A successfully refreshed from Google Patents.
US4079476A
Expired / Lapsed
US
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Fiberglass footbridge
Assignee: Enduro Systems Inc
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Filing: 1977-07-11
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Granted: 1978-03-21
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Expires: 1997-07-11
Abstract
Abstract A fiberglass footbridge comprising a floor, handrails, and a web between the floor and the handrails, all of fiberglass. A continuous layer of fiberglass filaments that extend parallel with the bridge are formed in the handrails and the corners of the floor. U-shaped supporting members are attached around the web and the floor, and are spaced between the ends of the bridge. A subfloor or torque box is formed between the supporting members below the floor.
Inventors
- 👤 Andrew Green
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:00
CPC Classifications
E; E01; E01D; E01D2/00; E01D2101/00; E01D2101/40
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
108 words
A footbridge suspended between a support at each end, comprising: a horizontal layer of nonmetallic fibers connected between the supports to define a floor for pedestrians, with a continuous layer of nonmetallic filaments formed in the floor, each filament extending substantially parallel with the length of the floor; a pair of nonmetallic fiber handrails spaced laterally apart and disposed above the floor, each handrail having a continuous layer of nonmetallic filaments extending substantially parallel with the length of the handrails; and two webs of nonmetallic fiber, each mounted perpendicular to the floor and connecting the floor with one of the handrails substantially along the length of the footbridge.
Claim 2
Dependent Claim
108 words
A footbridge suspended between a support at each end, comprising: a horizontal layer of nonmetallic fibers connected between the supports to define a floor for pedestrians, with a continuous layer of nonmetallic filaments formed in the floor, each filament extending substantially parallel with the length of the floor; a pair of nonmetallic fiber handrails spaced laterally apart and disposed above the floor, each handrail having a continuous layer of nonmetallic filaments extending substantially parallel with the length of the handrails; and two webs of nonmetallic fiber, each mounted perpendicular to the floor and connecting the floor with one of the handrails substantially along the length of the footbridge.
Claim 3
Dependent Claim
27 words
The footbridge according to claim 1 wherein the continuous filaments in the floor are disposed on each side of the floor adjacent its connection with the webs.
Claim 4
Dependent Claim
46 words
The footbridge according to claim 1, further comprising: at least one U-shaped supporting member mounted to the footbridge intermediate its ends, the supporting member having upright legs connected to the exterior sides of the webs and a base connected to the lower surface of the floor.
Claim 5
Dependent Claim
30 words
The footbridge according to claim 3 wherein the footbridge contains at least two supporting members spaced apart along the length, with a subfloor mounted below the floor between supporting members.
Claim 6
Dependent Claim
33 words
The footbridge according to claim 1 wherein nonmetallic fibers in the floor, handrails, and webs comprise layers of woven fiberglass and layers of fiberglass mat, and wherein the continuous filaments are fiberglass filaments
Claim 7
Dependent Claim
163 words
A fiberglass footbridge suspended between a support at each end comprising: a horizontal layer of fiberglass connected between the supports to define a floor for pedestrians, with a continuous layer of fiberglass filaments formed on each side edge of the floor and extending substantially parallel with the length of the floor; a pair of fiberglass handrails spaced laterally apart and disposed above the floor, each handrail having a continuous layer of fiberglass filaments extending substantially parallel with the handrails; two webs of fiberglass, each mounted perpendicular between the floor and one of the handrails and extending substantially the length of the footbridge; a plurality of U-shaped supporting members spaced along the length of the foorbridge intermediate its ends, the supporting members having upright legs connected to the exterior sides of the webs and a base connected to the lower surface of the floor; and a subfloor mounted below the floor by vertical sides in the same plane and extending between the supporting members.
Claim 8
Dependent Claim
163 words
A fiberglass footbridge suspended between a support at each end comprising: a horizontal layer of fiberglass connected between the supports to define a floor for pedestrians, with a continuous layer of fiberglass filaments formed on each side edge of the floor and extending substantially parallel with the length of the floor; a pair of fiberglass handrails spaced laterally apart and disposed above the floor, each handrail having a continuous layer of fiberglass filaments extending substantially parallel with the handrails; two webs of fiberglass, each mounted perpendicular between the floor and one of the handrails and extending substantially the length of the footbridge; a plurality of U-shaped supporting members spaced along the length of the foorbridge intermediate its ends, the supporting members having upright legs connected to the exterior sides of the webs and a base connected to the lower surface of the floor; and a subfloor mounted below the floor by vertical sides in the same plane and extending between the supporting members.
References Cited (Backward Citations)
US2367291A
Cited
US3169602A
Cited
US3328818A
Cited
US3350497A
Cited
US3476338A
Cited
US3591437A
Cited
US4029172A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-20 | 1981-09-19 | 1982-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-20 | 1985-09-19 | 1986-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-20 | 1989-09-19 | 1990-03-21 | $7700.00 | Window Closed / Lapsed |