US3895162A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite metal fiber wool resin product and method
Assignee: Boeing Co
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Filing: 1973-02-16
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Granted: 1975-07-15
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Expires: 1993-02-16
Abstract
Abstract A structural material having a multiplicity of high strength filaments therein which have significant length-to-diameter ratios and are mechanically interlocked with each other to form a wool having substantially isotropic strength characteristics. A bonding material, which impregnates the interstices of the wool, is bonded to the filaments to distribute internal stresses throughout the structural material. The wool has a structural integrity even in the absence of the bonding material and provides the structural material with tensile and shear strengths which are significantly greater than those of the bonding material. The structural material has a relatively high strengthto-density ratio and may have fatigue characteristics superior to those of some metals.
Inventors
- 👤 Harold E Lemont
- 👤 Robert C Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:17
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/12; B29; B29C; B29C70/00; B29C70/04; B29C70/06; B29C70/10; B29C70/12; B32B5/00; B32B5/02; B32B5/028; B32B5/22; B32B5/24; B32B5/26; B29K; B29K2105/00; B29K2105/06; B29K2105/12; B29K2105/128; B32B2262/00; B32B2262/10; B32B2262/103; B32B2305/00; B32B2305/38; B32B2307/00; B32B2307/50; B32B2307/552; B32B2307/70; B32B2307/708; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12444; Y10T428/12486; Y10T428/249921
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
95 words
A STRUCTURAL MATERIAL COMPRISING: A PLURALITY OF FLEXIBLE, RANDOMLY ORIENTED AND ENTANGLED METAL FILAMENTS WHICH ARE MECHANICALY INTERLOCKED WITH EACH OTHER TO FORM A METAL VQOOL: SAID METAL FILAMENTS HAVING A SUBSTANTIALY LENGTH-TO-SIZE RATIO WITH AN ASPECT RATIO GREATER THAN 12,000 TO PROVIDE SAID STRUCTURAL MATERIAL WITH SUBSTANTIALLY ISOTROPIC STRENGTH CHARACTERISTICS: SAID METAL FILAMENTS HAVING A CIRCULAR CROSS SECTION, AND A BONDING MATERIAL DISPOSED WITHIN THE INTERSTICES OF SAID METAL WOOL AND ADHERENTLY BONDED TO SAID METAL FILAMENTS, WHEREBY STRESSES APPLIED TO SAID STRUCTURAL MATERIAL ARE RESISTED IN A RELATIVELY UNIFORM MANNER BY SAID FILAMENTS,
Claim 2
Dependent Claim
95 words
A STRUCTURAL MATERIAL COMPRISING: A PLURALITY OF FLEXIBLE, RANDOMLY ORIENTED AND ENTANGLED METAL FILAMENTS WHICH ARE MECHANICALY INTERLOCKED WITH EACH OTHER TO FORM A METAL VQOOL: SAID METAL FILAMENTS HAVING A SUBSTANTIALY LENGTH-TO-SIZE RATIO WITH AN ASPECT RATIO GREATER THAN 12,000 TO PROVIDE SAID STRUCTURAL MATERIAL WITH SUBSTANTIALLY ISOTROPIC STRENGTH CHARACTERISTICS: SAID METAL FILAMENTS HAVING A CIRCULAR CROSS SECTION, AND A BONDING MATERIAL DISPOSED WITHIN THE INTERSTICES OF SAID METAL WOOL AND ADHERENTLY BONDED TO SAID METAL FILAMENTS, WHEREBY STRESSES APPLIED TO SAID STRUCTURAL MATERIAL ARE RESISTED IN A RELATIVELY UNIFORM MANNER BY SAID FILAMENTS,
Claim 3
Dependent Claim
14 words
The structural material of claim 1 wherein said filaments are formed of stainless steel.
Claim 4
Dependent Claim
14 words
The structural material of claim 1 wherein said bonding material is an epoxy resin.
Claim 5
Dependent Claim
49 words
The structural material of claim 1 wherein said metal wool is in a compressed state within said structural material, whereby stresses within said metal wool due to its compressed state are maintained within said structural material through contact of the bonding material with the metal filaments forming said wool.
Claim 6
Dependent Claim
15 words
The structural material of claim 4 wherein said wool is formed of stainless steel filaments.
Claim 7
Dependent Claim
40 words
The structural material of claim 1 including a plurality of primary strength elements positioned in laminar planes within said structural material with said metal wool extending between said laminar planes to increase the interlaminar shear strength of the structural material.
Claim 8
Dependent Claim
15 words
The structural material of claim 6 wherein said metal filaments are formed of stainless steel.
Claim 9
Independent Claim
130 words
A method for forming a structural material including the steps of: providing a plurality of high strength flexible metallic filaments having a circular cross section with said filaments being randomly oriented and entangled and mechanically interlocked with each other to form a metal wool and with each of said filaments having a relatively high length-to-size ratio to provide an aspect ratio greater than 12,000; impregnating the interstices of the metal wool with a relatively fluid bonding material; compressing said metal wool to place said metal filaments in a stressed condition after substantially completing the impregnation of the wool with the relatively fluid bonding material, and hardening said fluid bonding material to form a bond between the bonding material and the metal filaments with the metal filaments in a stressed condition.
Claim 10
Independent Claim
130 words
A method for forming a structural material including the steps of: providing a plurality of high strength flexible metallic filaments having a circular cross section with said filaments being randomly oriented and entangled and mechanically interlocked with each other to form a metal wool and with each of said filaments having a relatively high length-to-size ratio to provide an aspect ratio greater than 12,000; impregnating the interstices of the metal wool with a relatively fluid bonding material; compressing said metal wool to place said metal filaments in a stressed condition after substantially completing the impregnation of the wool with the relatively fluid bonding material, and hardening said fluid bonding material to form a bond between the bonding material and the metal filaments with the metal filaments in a stressed condition.
Claim 11
Dependent Claim
14 words
The method of claim 8 wherein said metal filaments are formed of stainless steel.
Claim 12
Dependent Claim
13 words
The method of claim 8 wherein said bonding material is an epoxy resin.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-14 | 1979-01-13 | 1979-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-14 | 1983-01-13 | 1983-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-14 | 1987-01-13 | 1987-07-15 | $7700.00 | Window Closed / Lapsed |