Patent US703234A successfully refreshed from Google Patents.
Patent US3640833A successfully refreshed from Google Patents.
US3640833A
Expired / Lapsed
US
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Vibration damped sandwich systems having interlayers of vinyl acetate-ethylene-n-butylacrylate copolymers
Assignee: Hoechst AG
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Filing: 1970-10-19
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Granted: 1972-02-08
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Expires: 1990-10-19
Abstract
Abstract Vibration damped sandwich systems having an improved damping effect within a broad range of temperature and consisting of hard plates and a vibration damping interlayer, said interlayer comprising a copolymer of ethylene, vinyl acetate, n-butylacrylate and acrylic and/or methacrylic acid.
Inventors
- 👤 Hermann Oberst
- 👤 Leonhard Reihs
- 👤 Joachim Ebigt
- 👤 Gunther Duve
- 👤 Alfred Schommer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:04
CPC Classifications
C; C08; C08L; C08L31/00; C08L31/02; C08L31/04; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/31504; Y10T428/31678; Y10T428/31692; Y10T428/31699
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
39 words
An improved vibration damping interlayer as recited in claim 1, wherein the copolymer contains up to 1 percent weight, calculated on the copolymer, of a filler selected from the group consisting of heavy spar, silicic acid, graphite and soot.
Claim 2
Dependent Claim
24 words
A vibration damped sandwich system as recited in claim 1 comprising outer plates having a thickness ratio to one another from 1:1 to 1:4.
References Cited (Backward Citations)
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US3232895A
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US3256228A
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US3399103A
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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) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |