US3769142A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-woven locked ply composite structure
Assignee: McDonnell Douglas Corp
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Filing: 1970-12-04
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Granted: 1973-10-30
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Expires: 1990-12-04
Abstract
Abstract A non-prebuckled fibrous composite structure with multiple plies interlocked with vertical fiber locks through the plies to improve interlaminar shear characteristics of the composite structure.
Inventors
- 👤 R Holmes
- 👤 R Dobbs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:06
CPC Classifications
D; D04; D04H; D04H3/00; D04H3/08; D04H3/10; B; B29; B29C; B29C70/00; B29C70/04; B29C70/06; B29C70/10; B29C70/16; B29C70/24; B29C70/28; B29C70/54; B29C70/543; D04H3/02; D04H3/07; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24058; Y10T428/24124
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
81 words
A composite structure comprising a plurality of plies of continuous elongated straight fibers, said plies being stacked in planar relationship, one on top of the other, to form a threedimensional grid, said plies being oriented in various directions, said plies having crossover intersections of fibers fiber ply locks extending through said piles, within openings of said grid, and normal to the planes of said plies, said locks being looped and tied around the fibers of the various plies at their intersections.
Claim 2
Dependent Claim
81 words
A composite structure comprising a plurality of plies of continuous elongated straight fibers, said plies being stacked in planar relationship, one on top of the other, to form a threedimensional grid, said plies being oriented in various directions, said plies having crossover intersections of fibers fiber ply locks extending through said piles, within openings of said grid, and normal to the planes of said plies, said locks being looped and tied around the fibers of the various plies at their intersections.
Claim 3
Dependent Claim
25 words
A composite structure as in claim 1 wherein each crossover intersection has an individual lock spaced and separate from the locks of adjacent crossover intersections.
Claim 4
Dependent Claim
24 words
A composite structure as in claim 1 wherein said fibers are pre-impregnated with a plastic resin system for subsequent curing into a rigid structure.
References Cited (Backward Citations)
US2562951A
Cited
US2778761A
Cited
US2705692A
Cited
US2789076A
Cited
US3203849A
Cited
US3647606A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |