US4324831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Formed structures based on synthetic fibers and having soundproofing properties
Assignee: Montedison SpA
•
Filing: 1979-03-30
•
Granted: 1982-04-13
•
Expires: 1999-03-30
Abstract
Abstract Formed structures comprising synthetic thermoplastic fibrils or fibrids having a surface area (specific surface) higher than 1 m 2 /g and useful for soundproofing purposes are provided. Methods for making the structures are also disclosed.
Inventors
- 👤 Paolo Parrini
- 👤 Vittorio Ciaccia
- 👤 Guglielmo Corrieri
- 👤 Gian P. Righi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:44
CPC Classifications
G; G10; G10K; G10K11/00; G10K11/16; G10K11/162; G10K11/165; Y; Y10; Y10S; Y10S428/00; Y10S428/903; Y10T; Y10T428/00; Y10T428/27; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2938; Y10T428/2964; Y10T428/2967; Y10T428/2971; Y10T428/2982; Y10T428/2991; Y10T428/2998; Y10T442/00; Y10T442/20; Y10T442/25; Y10T442/60; Y10T442/699
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
120 words
Homogeneous agglomerates having anti-acoustical properties and an apparent density comprised between 0.04 and 0.5 g/cc, said agglomerates consisting essentially of mixtures of fibrils or fibrids of thermoplastic polymers having a surface area greater than 1 m 2 /g, and in the range 4.5 m 2 /g to 7.5 m 2 /g and a binder therefor selected from the group consisting of animal or vegetable glues, synthetic resins and thermoplastic polymers which are compatible with the polymer of which the fibrils or fibrids of the agglomerate are formed and have a melting temperature lower than the melting temperature of the fibrils or fibrids, the weight ratio between the fibrils or fibrids and binder being comprised between about 95:5 and about 50:50.
Claim 2
Dependent Claim
120 words
Homogeneous agglomerates having anti-acoustical properties and an apparent density comprised between 0.04 and 0.5 g/cc, said agglomerates consisting essentially of mixtures of fibrils or fibrids of thermoplastic polymers having a surface area greater than 1 m 2 /g, and in the range 4.5 m 2 /g to 7.5 m 2 /g and a binder therefor selected from the group consisting of animal or vegetable glues, synthetic resins and thermoplastic polymers which are compatible with the polymer of which the fibrils or fibrids of the agglomerate are formed and have a melting temperature lower than the melting temperature of the fibrils or fibrids, the weight ratio between the fibrils or fibrids and binder being comprised between about 95:5 and about 50:50.
Claim 3
Dependent Claim
18 words
Formed structures for use as sound-absorbing and sound-insulating means and consisting essentially of agglomerates according to claim 1.
Claim 4
Dependent Claim
17 words
Panels for use as sound-absorbing and sound-insulating means and consisting essentially of agglomerates according to claim 1.
Claim 5
Dependent Claim
15 words
Agglomerates according to claim 1, wherein said fibrils or fibrids consist predominantly of isotactic polypropylene.
Claim 6
Dependent Claim
13 words
Agglomerates according to claim 1, wherein said fibrils or fibrids consist of polyethylene.
Claim 7
Dependent Claim
21 words
Agglomerates according to claim 1, and formed of fibrils or fibrids of predominantly isotactic polypropylene and fibrils or fibrids of polyethylene.
Claim 8
Dependent Claim
42 words
Agglomerates according to claim 1, in which the binder for the fibrils or fibrids is a thermoplastic polymer having a melting temperature lower than the melting temperature of the thermoplastic polymer from which the majority of the fibrils or fibrids are formed.
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) | 1985-04-12 | 1985-10-12 | 1986-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-04-12 | 1989-10-12 | 1990-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-04-12 | 1993-10-12 | 1994-04-13 | $7700.00 | Window Closed / Lapsed |