US3215225A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laminated acoustic panels with outer metal layers, fibrous core and viscoelastic damping layer
Assignee: Korfund Dynamics Corp
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Filing: 1961-11-29
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Granted: 1965-11-02
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Expires: 1981-11-29
Abstract
No abstract record available.
Inventors
- 👤 Kirschner Francis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:04
CPC Classifications
E; E04; E04B; E04B9/00; E04B9/04; E04B9/045; B; B32; B32B; B32B15/00; B32B15/04; B32B15/08; E04B1/00; E04B1/62; E04B1/74; E04B1/82; E04B1/84; E04B1/86; G; G10; G10K; G10K11/00; G10K11/16; G10K11/162; G10K11/168; E04B2001/8457; E04B2001/8461; E04B2001/8476; E04B2001/848; E04B2001/8485; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652; Y10T428/31656
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
108 words
A PANEL OF SANDWICH TYPE CONSTRUCTION SUITABLE FOR USE IN THE REDUCTION OF NOISE COMPRISING A PAIR OF SPACED METAL SHEETS, A LAYER OF A VISCOELASTIC DAMPING MATERIAL UNDERLYING THE INTERIOR SURFACE OF AT LEAST ONE OF SAID METAL SHEETS, A CORE OF A STIFF, SELF-SUPPORTING FIBROUS BUILDING BOARD HAVING SUFFICIENT THICKNESS TO IMPART LOADBEARING STRENGTH TO THE PANEL, INTERPOSED BETWEEN SAID DAMPING LAYER AND SAID OTHER SHEETS, AND ADHESIVE MEANS UNITING SAID METAL SHEETS, DAMPING LAYER AND CORE INTO A FINISHED PANEL, SAID DAMPING LAYER BEING BONDED TO THE ADJACENT METAL SHEET OVER A SUBSTANTIAL PORTION OF THE AREA THEREOF, WHEREBY SAID DAMPING LAYER AND SAID ONE
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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) | 1968-11-01 | 1969-05-03 | 1969-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-01 | 1973-05-03 | 1973-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-01 | 1977-05-03 | 1977-11-02 | $7700.00 | Window Closed / Lapsed |