US3674625A
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Vibration damped sandwich systems having interlayers of vinyl acetate/n-butyl acrylate/dibutyl maleate/crotonic acid copolymers
Assignee: Hoechst AG
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Filing: 1970-12-14
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Granted: 1972-07-04
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Expires: 1990-12-14
Abstract
Abstract A VIBRATION DAMPED SANDWICH SYSTEM COMPRISING TWO HARD PLATES AND INTERPOSED BETWEEN THE PLATES A VIBRATION DAMPING INTERLAYER COMPRISING A COPOLYMER OF 30 TO 40% BY WEIGHT OF VINYL ACETATE, 30-40% BY WEIGHT OF N-BUTYL ACRYLATE, 30 TO 10% BY WEIGHT OF DIBUTYL MALEATE AND 5 TO 15% BY WEIGHT OF CROTONIC ACID.
Inventors
- 👤 Hermann Oberst
- 👤 Joachim Ebigt
- 👤 Gunther Duve
- 👤 Alfred Schommer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:03
CPC Classifications
C; C09; C09J; C09J133/00; C09J133/04; C09J133/06; C09J133/08; C09J131/00; C09J131/02; C09J131/04; C08; C08L; C08L2666/00; C08L2666/54; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/31504; Y10T428/31678; Y10T428/31692; Y10T428/31699
Claims Analysis
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References Cited (Backward Citations)
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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) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |