Patent US3616111A successfully refreshed from Google Patents.
US3616111A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic landing pad of interconnected panels
Assignee: FMC Corp
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Filing: 1969-02-27
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Granted: 1971-10-26
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Expires: 1989-02-27
Abstract
Abstract A landing pad for helicopters is made of individual laminated panels having top and bottom laminae of woven fiberglass and a relatively thick core lamina of a nonwoven organic fiber which is bonded to the said top and bottom laminae by a polyester resin extensively impregnated with a particulate filler. Upper and lower surfaces of the panels are textured with matching recesses and protuberances respectively which give the panels an interlocking characteristic that is effective when the panels are laid upon one another in separate layers. In final form the layers of laminated panels are stapled together to give a cohesive landing pad of high durability.
Inventors
- 👤 Harry Raech Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:58
CPC Classifications
B; B32; B32B; B32B5/00; B32B5/22; B32B5/24; B32B5/26; E; E01; E01C; E01C9/00; E01C9/08; E01C9/086; B32B3/00; B32B3/26; B32B3/30; B32B5/02; B32B5/022; B32B5/024; E01F; E01F3/00; B32B2262/00; B32B2262/10; B32B2262/101; Y; Y10; Y10T; Y10T428/00; Y10T428/16; Y10T428/169; Y10T428/17; Y10T428/18; Y10T428/24; Y10T428/24628; Y10T428/24669
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
57 words
A platform comprising a plurality of panels having upper and lower layers of woven fiber glass roving, a core layer of organic fiber mat, and a bonding medium of polyester resin to secure the layers together, said panels having a tread of recesses on their upper surface and a matching tread of protrusions on their lower surface.
Claim 2
Dependent Claim
80 words
The landing pad of claim 1 wherein there are at least two layers of said panels, each layer consisting of a plurality of said panels disposed in abutting side-by-side relationship defining joints between panels, the joints of one layer being offset from the joints of an adjacent layer and the tread of protrusions on the lower surface of an upper layer mating with and fitting into the matching thread of recesses on the upper surface of the layer next below.
Claim 3
Dependent Claim
32 words
The landing pad of claim 1 wherein said polyester resin is propylene maleate phthalate of medium unsaturation with an equal weight of styrene as a monomer and benzoyl peroxide as a catalyst.
Claim 4
Dependent Claim
14 words
The landing pad of claim 4 wherein said particulate filler is 300-mesh calcium carbonate.
Claim 5
Dependent Claim
21 words
The landing pad of claim 3 wherein panels in one of said layers are stapled to panels in an adjacent layer.
Claim 6
Dependent Claim
79 words
The platform of claim 2 wherein there are at least two layers of said panels, each layer consisting of a plurality of said panels disposed in abutting side-by-side relationship defining joints between panels, the joints of one layer being offset from the joints of an adjacent layer and the tread of protrusions on the lower surface of an upper layer mating with and fitting into the matching tread of recesses on the upper surface of the layer next below.
Claim 7
Dependent Claim
20 words
The platform of claim 7 wherein panels in one of said layers are stapled to panels in an adjacent layer.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |