Patent US3751071A successfully refreshed from Google Patents.
US3553072A
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Vibration damped sandwich systems
Assignee: Hoechst AG
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Filing: 1968-11-18
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Granted: 1971-01-05
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Expires: 1988-11-18
Abstract
Abstract A VIBRATION DAMPED SANDWICH SYSTEM COMPRISING TWO HARD PLATES AND INTERPOSED BETWEEN THE PLATES A VIBRATION DAMPING INTERLAYER COMPRISING A GRAFT POLYMER OF A MIXTURE OF 66% BY WEIGHT OF STYRENE AND 34% BY WEIGHT OF ACROYLONITRILE ON COPOLYMERS OF 10 TO 30% BY WEIGHT OF VINYL ACETATE AND 90 TO 70% BY WEIGHT OF ETHYLENE.
Inventors
- 👤 Hermann Oberst
- 👤 Joachim Ebigt
- 👤 Gunther Duve
- 👤 Alfred Schommer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:14
CPC Classifications
E; E04; E04B; E04B1/00; E04B1/62; E04B1/92; E04B1/98; C; C08; C08F; C08F255/00; C08F255/02; C08F255/026; Y; Y10; Y10S; Y10S260/00; Y10S260/46; 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)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |