US4077491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acoustical composite
Assignee: Acon Inc
•
Filing: 1976-08-27
•
Granted: 1978-03-07
•
Expires: 1996-08-27
Abstract
Abstract An improved acoustical material, which is simple in construction and uses conventional, inexpensive materials, for use as a lining material in association with noise generating machinery is disclosed. It comprises two woven fiberglass layers and an intermediate non-woven fibrous layer to form a composite which will not deteriorate, swell or retain oil, solvents, or water such as are found in machinery, and which has acoustical flow resistance of between 20 rayls and 80 rayls. The flexible composite may be used over a highly porous layer which is or acts as a dead air space relative to the composite.
Inventors
- 👤 Keith M. Hankel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:29
CPC Classifications
E; E04; E04B; E04B1/00; E04B1/62; E04B1/74; E04B1/82; E04B1/84; E04B1/8409; E04B2001/742; E04B2001/748; E04B2001/8263; E04B2001/8281; E04B2001/8457; E04B2001/8461
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
110 words
An acoustical composite capable of being readily bent and shaped to follow intricate curves and contours consisting of: a. two layers of woven fiberglass cloth, each haivng an acoustical flow resistance of between 10 rayls and 20 rayls, and b. a flexible, porous, non-woven, fibrous material sandwiched between said woven fiberglass cloth layers and bonded thereto, said composite having a total thickness of between about 1/8 and 3/4 inch and a total weight of between about 1 ounce per square foot and 4 ounces per square foot and a total acoustical flow resistance of between 20 rayls and 80 rayls and being resistant to fire, deterioration, swelling, and liquid retention.
Claim 2
Dependent Claim
110 words
An acoustical composite capable of being readily bent and shaped to follow intricate curves and contours consisting of: a. two layers of woven fiberglass cloth, each haivng an acoustical flow resistance of between 10 rayls and 20 rayls, and b. a flexible, porous, non-woven, fibrous material sandwiched between said woven fiberglass cloth layers and bonded thereto, said composite having a total thickness of between about 1/8 and 3/4 inch and a total weight of between about 1 ounce per square foot and 4 ounces per square foot and a total acoustical flow resistance of between 20 rayls and 80 rayls and being resistant to fire, deterioration, swelling, and liquid retention.
Claim 3
Dependent Claim
20 words
An acoustical composite as set forth in claim 1 wherein said flexible, porous, non-woven, fibrous material is a polyester fill.
Claim 4
Dependent Claim
22 words
An acoustical composite as set forth in claim 2 wherein said composite is sewn together with the stitching forming discrete patterned areas.
Claim 5
Dependent Claim
162 words
An acoustical assembly for use as a lining material in association with noise generating machinery consisting of: a. a composite capable of being readily bent and shaped to follow intricate curves and contours consisting of two layers of woven fiberglass cloth, each having an acoustical flow resistance of between 10 rayls and 20 rayls and a flexible, porous, non-woven, fibrous material sandwiched between said woven fiberglass cloth layers and bonded thereto, said composite having a total thickness of between about 1/8 and 3/4 inch and a total weight of between about one ounce per square foot and four ounces per square foot and a total acoustical flow resistance of between 20 rayls and 80 rayls and being resistant to fire, deterioration, swelling, liquid retention and other adverse conditions as may be found in said noise generating machinery, and b. a highly porous non-woven fibrous mat having a binder therein joined to said composite and serving as a dead air space relative thereto.
Claim 6
Dependent Claim
162 words
An acoustical assembly for use as a lining material in association with noise generating machinery consisting of: a. a composite capable of being readily bent and shaped to follow intricate curves and contours consisting of two layers of woven fiberglass cloth, each having an acoustical flow resistance of between 10 rayls and 20 rayls and a flexible, porous, non-woven, fibrous material sandwiched between said woven fiberglass cloth layers and bonded thereto, said composite having a total thickness of between about 1/8 and 3/4 inch and a total weight of between about one ounce per square foot and four ounces per square foot and a total acoustical flow resistance of between 20 rayls and 80 rayls and being resistant to fire, deterioration, swelling, liquid retention and other adverse conditions as may be found in said noise generating machinery, and b. a highly porous non-woven fibrous mat having a binder therein joined to said composite and serving as a dead air space relative thereto.
Claim 7
Dependent Claim
24 words
An acoustical assembly as in claim 4 wherein the acoustical assembly has a total thickness of between approximately 11/8 inch and approximately 23/4 inches.
References Cited (Backward Citations)
US3082143A
Cited
US3322233A
Cited
US3783969A
Cited
US3748799A
Cited
US3858676A
Cited
US3977492A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-06 | 1981-09-05 | 1982-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-06 | 1985-09-05 | 1986-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-06 | 1989-09-05 | 1990-03-07 | $7700.00 | Window Closed / Lapsed |