US3602332A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lead-loaded microporous acoustic panel
Assignee: WR Grace and Co
•
Filing: 1969-01-08
•
Granted: 1971-08-31
•
Expires: 1989-01-08
Abstract
Abstract Sound, particularly airborne sound, is attenuated using a microporous sheet of a resilient, normally solid polymeric material (e.g. polyethylene), which sheet has finely divided lead particles uniformly dispersed therein.
Inventors
- 👤 Bonderinko Hollenbeck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:24
CPC Classifications
G; G10; G10K; G10K11/00; G10K11/16; G10K11/162; G10K11/165; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249976; Y10T428/249977; Y10T428/249986; Y10T428/25; Y10T428/256
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
16 words
The barrier of claim 1 wherein said finely divided lead particles comprise particles of lead oxide.
Claim 2
Dependent Claim
12 words
The barrier of claim 6 wherein said polymeric material is a polyolefin.
Claim 3
Dependent Claim
73 words
A sound attenuating barrier comprising a layer of construction material, and, adjacent said layer, a microporous sheet comprising a resilient normally solid polyolefin containing about 20 to 95 percent by weight of finely divided lead particles uniformly dispersed therein, said pores being interconnecting and having an average diameter in the range of about 0.01 to 1 microns and said sheet having a void volume in the range of about 30 to 70 percent.
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) | 1974-08-30 | 1975-03-01 | 1975-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-30 | 1979-03-01 | 1979-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-30 | 1983-03-01 | 1983-08-31 | $7700.00 | Window Closed / Lapsed |