US3154172A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diaphragm and impedance means
Assignee: Tibbetts Industries Inc
•
Filing: 1962-07-19
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Granted: 1964-10-27
•
Expires: 1982-07-19
Abstract
No abstract record available.
Inventors
- 👤 George C Tibbetts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:47
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
49 words
AN ACOUSTIC IMPEDANCE ELEMENT COMPRISING A LAMINATE SHEET INCLUDING TWO MATERIALS OF DIFFERING ELASTIC MODULI, HAVING AN OUTER SUPPORT PORTION COMPRISING SAID MATERIALS, AN INTERMEDIATE PORTION FORMING A FLEXIBLE SURROUND RESTRICTED TO THE MATERIAL OF LOWER ELASTIC MODULUS, AND AN INNER PORTION COMPRISING A MASS SUPPORTED BY SAID SURROUND.
Claim 2
Dependent Claim
49 words
AN ACOUSTIC IMPEDANCE ELEMENT COMPRISING A LAMINATE SHEET INCLUDING TWO MATERIALS OF DIFFERING ELASTIC MODULI, HAVING AN OUTER SUPPORT PORTION COMPRISING SAID MATERIALS, AN INTERMEDIATE PORTION FORMING A FLEXIBLE SURROUND RESTRICTED TO THE MATERIAL OF LOWER ELASTIC MODULUS, AND AN INNER PORTION COMPRISING A MASS SUPPORTED BY SAID SURROUND.
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Cited
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Cited
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Cited
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Cited
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Cited
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Cited
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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) | 1967-10-27 | 1968-04-27 | 1968-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-10-27 | 1972-04-27 | 1972-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-10-27 | 1976-04-27 | 1976-10-27 | $7700.00 | Window Closed / Lapsed |