Patent US3904456A successfully refreshed from Google Patents.
US3904456A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for inhibiting transmission of airborne noise
Assignee: E A P Akustik GmbH
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Filing: 1973-10-23
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Granted: 1975-09-09
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Expires: 1993-10-23
Abstract
Abstract It has been found that transmission of airborne noise can be inhibited by interposing in the air space between the noise source and the location to be insulated a thin, dense, normally self supporting film or sheet composed essentially of certain ethylene-vinyl acetate copolymers and from about 60 to about 90 percent by weight of inorganic filler materials effective to produce an overall density greater than at least 2 grams per cubic centimeter. The average vinyl acetate content of the ethylene-vinyl acetate copolymer, preferably a mixture or blend of copolymers, must be in the range of from about 10 to about 42 percent by weight of the copolymer ingredient. The normally selfsupporting film or sheet gives a level of sound blocking greater than that expected from calculations according to the Mass Action Law (sometimes referred to as Berger''s Law.
Inventors
- 👤 Herwig Josef Schwartz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:47
CPC Classifications
G; G10; G10K; G10K11/00; G10K11/16; G10K11/162; G10K11/165; E; E04; E04B; E04B1/00; E04B1/62; E04B1/74; E04B1/82; E04B1/84; E04B1/8409; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678; Y10T428/31692
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
144 words
METHOD FOR INHIBITING TRANSMISSION OF AIRBORNE NOISE WHICH COMPRISES INTERPOSING IN THE AIR SPACE BETWEEN THE NOISE SOURCE AND THE LOACTION TO BE INSULATED A THIN, DENSE, FILM COMPOSED ESSENTIALLY OF ABOUT 10 TO ABOUT 40 WEIGHT PERCENT ETHYLENE VINYL ACETATE COPOLYMER HAVING AN AVERAGE VINYL ACETATE CONTENT OF FROM ABOUT 10 TO ABOUT 42 PERCENT BY WEIGHT AND A GLASS TRANSITION TEMPERATURE OF AT LEAST ABOUT 30* CENTIGRADE BELOW THE AVERAGE AMIBIENT TEMPERATURE IN THE SAID AIR SPACE AND FROM ABOUT 60 TO ABOUT 90 PERCENT BY WEIGHT OF INORGANIC FILLER MATERIALS EFFECTIVE TO PRODUCE A FILM OR SHEET DENSITY GREATER THAN ABOUT 2 GRAMS PER CUBIC CENTIMETER, SAID FILM FURTHER BEING ABLE TO BE SHAPED INTO A THREE DIMENSIONAL FORM WHICH IS RETAINED IN STORAGE, SHIPMENT AND IN USE AS AN INHIBITOR OF TRANSMISSION OF SAID AIRBORNE NOISE IN SAID AIR SPACE.
Claim 2
Dependent Claim
144 words
METHOD FOR INHIBITING TRANSMISSION OF AIRBORNE NOISE WHICH COMPRISES INTERPOSING IN THE AIR SPACE BETWEEN THE NOISE SOURCE AND THE LOACTION TO BE INSULATED A THIN, DENSE, FILM COMPOSED ESSENTIALLY OF ABOUT 10 TO ABOUT 40 WEIGHT PERCENT ETHYLENE VINYL ACETATE COPOLYMER HAVING AN AVERAGE VINYL ACETATE CONTENT OF FROM ABOUT 10 TO ABOUT 42 PERCENT BY WEIGHT AND A GLASS TRANSITION TEMPERATURE OF AT LEAST ABOUT 30* CENTIGRADE BELOW THE AVERAGE AMIBIENT TEMPERATURE IN THE SAID AIR SPACE AND FROM ABOUT 60 TO ABOUT 90 PERCENT BY WEIGHT OF INORGANIC FILLER MATERIALS EFFECTIVE TO PRODUCE A FILM OR SHEET DENSITY GREATER THAN ABOUT 2 GRAMS PER CUBIC CENTIMETER, SAID FILM FURTHER BEING ABLE TO BE SHAPED INTO A THREE DIMENSIONAL FORM WHICH IS RETAINED IN STORAGE, SHIPMENT AND IN USE AS AN INHIBITOR OF TRANSMISSION OF SAID AIRBORNE NOISE IN SAID AIR SPACE.
Claim 3
Dependent Claim
16 words
Method as defined in claim 1 wherein said inorganic filler materials consist principally of barium sulfate.
Claim 4
Dependent Claim
20 words
Method as defined in claim 1 wherein said film has a thickness of about 1 millimeter to about 15 millimeters.
Claim 5
Dependent Claim
46 words
Method as defined in claim 1 wherein said ethylene-vinyl acetate copolymer is a mixture of at least two ethylene-vinyl acetate copolymers, one containing about 10 to about 17 percent by weight vinyl acetate and at least one other containing about 45 percent by weight vinyl acetate.
Claim 6
Dependent Claim
39 words
Method as defined in claim 1 wherein the interposed film or sheet is pre-formed to a complementary shape and then bonded directly to the surface of a non insulatinng three dimensional substrate already present in the said air space.
Claim 7
Dependent Claim
15 words
Method as defined in claim 5 wherein said substrate is an auto engine compartment firewall.
Claim 8
Dependent Claim
13 words
Method as defined in claim 5 wherein said substrate is an auto dashboard.
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) | 1978-09-08 | 1979-03-10 | 1979-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-08 | 1983-03-10 | 1983-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-08 | 1987-03-10 | 1987-09-09 | $7700.00 | Window Closed / Lapsed |