US3784312A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flotation beam for matting construction
Assignee: United States Department of the Navy
•
Filing: 1972-06-12
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Granted: 1974-01-08
•
Expires: 1992-06-12
Abstract
Abstract Lightweight box beams filled with a plastic foam provide buoyancy for support matting in marshy or low bearing terrain. The beams have a substantially square or rectangular shaped cross section and connectors are placed on each beam to permit facile connection to other beams and to permit paneling to be attached thereto. Landing pads would be the most common use for the beams of this invention, but they can be used for a multitude of purposes.
Inventors
- 👤 D Gordon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:00
CPC Classifications
E; E01; E01C; E01C3/00; E01C3/006; E01C9/00; E01C9/08; E02; E02D; E02D27/00; E02D27/01; E02D27/04
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
165 words
A landing mat for providing support in low bearing terrain comprising: a plurality of cellular box beams filled with polyurethane foam to increase the buoyancy thereof positioned end-to-end and in a number of parallel rows; each beam having a male bayonet connector on one end and a female bayonet connector on the opposite end with the male bayonet connector of one beam engaging the female bayonet connector of the adjacent beam so that the beams are connected end-to-end; a male-female keylock panel connector mounted on the top of each box beam; a plurality of support panels positioned contiguously on top of the box beams; said panels having a female keylock engaging the male keylock of the panel connector on a beam in one row and a male keylock, on the opposite side of the support panel from the female keylock, engaging the female keylock of the panel connector on a beam in the next adjacent parallel row whereby the support panels form a continuous platform.
Claim 2
Dependent Claim
165 words
A landing mat for providing support in low bearing terrain comprising: a plurality of cellular box beams filled with polyurethane foam to increase the buoyancy thereof positioned end-to-end and in a number of parallel rows; each beam having a male bayonet connector on one end and a female bayonet connector on the opposite end with the male bayonet connector of one beam engaging the female bayonet connector of the adjacent beam so that the beams are connected end-to-end; a male-female keylock panel connector mounted on the top of each box beam; a plurality of support panels positioned contiguously on top of the box beams; said panels having a female keylock engaging the male keylock of the panel connector on a beam in one row and a male keylock, on the opposite side of the support panel from the female keylock, engaging the female keylock of the panel connector on a beam in the next adjacent parallel row whereby the support panels form a continuous platform.
Claim 3
Dependent Claim
36 words
The landing mat as defined in claim 1 wherein: the box beams are one foot in cross-section with a length of 8 feet, a one-quarter inch wall thickness and said beams filled with polyurethane foam filler.
References Cited (Backward Citations)
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Cited
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Cited
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Cited
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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) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |