Patent US3753843A successfully refreshed from Google Patents.
US3753843A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Molded structural panel
Assignee: Monostruct Corp Ltd
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Filing: 1970-06-29
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Granted: 1973-08-21
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Expires: 1990-06-29
Abstract
Abstract A panel comprises an essentially multi-cellular core and a seamless covering over major surfaces of the core and over at least a portion of the periphery thereof. The panel is produced in a mold by spacing the core away from the mold faces and molding the covering material around the core.
Inventors
- 👤 D Hutchison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:56
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/02; B29C44/12; B29C44/1266; B32; B32B; B32B29/00; B32B29/002; B32B29/005; B29C44/34; B29C44/58; B32B29/007; B32B3/00; B32B3/10; B32B3/12; E; E04; E04C; E04C2/00; E04C2/30; E04C2/34; E04C2/36; E04C2/365; B32B2266/00; B32B2266/02; B32B2266/0214; B32B2266/0278; B32B2317/00; B32B2317/12; B32B2317/122; B32B2607/00; Y; Y10; Y10T; Y10T428/00; Y10T428/23; Y10T428/234; Y10T428/236; Y10T428/24; Y10T428/24149; Y10T428/24355; Y10T428/24438; Y10T428/249921; Y10T428/249953; Y10T428/24996
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
132 words
A molded panel consisting essentially of a core and a substantially seamless covering of flowable and hardenable urethane based plastic foam material which is substantially rigid when hardened over said core; where said core has spaced apart first and second major faces with a sheet-like covering over said core defining said faces and a plurality of walls extending between said sheet-like coverings, said plurality of walls and said sheet-like coverings at said first and second major faces forming a plurality of cells extending between said major faces and bounded by said walls; the flowable and hardenable urethane based plastic foam material covering over said core being substantially seamless over said first and second major faces and over at least a portion of the outer periphery of said core between said major faces.
Claim 2
Dependent Claim
132 words
A molded panel consisting essentially of a core and a substantially seamless covering of flowable and hardenable urethane based plastic foam material which is substantially rigid when hardened over said core; where said core has spaced apart first and second major faces with a sheet-like covering over said core defining said faces and a plurality of walls extending between said sheet-like coverings, said plurality of walls and said sheet-like coverings at said first and second major faces forming a plurality of cells extending between said major faces and bounded by said walls; the flowable and hardenable urethane based plastic foam material covering over said core being substantially seamless over said first and second major faces and over at least a portion of the outer periphery of said core between said major faces.
Claim 3
Dependent Claim
30 words
The panel of claim 1 where said covering extends substantially seamlessly over said first and second major faces and over the entire periphery of said core between said major faces.
Claim 4
Dependent Claim
26 words
The panel of claim 1 where the material of said covering extends into at least one of said plurality of cells formed between said major faces.
Claim 5
Dependent Claim
23 words
A panel according to claim 2 where said core is of honeycomb structure and said first and second major faces are substantially parallel.
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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) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |