US3699481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low velocity highly anisotropic elastic materials
Assignee: Boeing North American Inc
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Filing: 1971-06-01
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Granted: 1972-10-17
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Expires: 1991-06-01
Abstract
Abstract This invention discloses a class of materials having a cellular structure which is suitable to slow the movement or velocity of elastic waves therein. An example of this class of materials is a cellular phenolic honeycomb polymer in which an elastic wave has a delay time of 0.6 milliseconds per inch in contrast to a delay time of 0.005 milliseconds per inch obtained in quartz, the most widely used prior art material. By proper modification of the cellular structure parameters, that is, the thickness of the individual cell wall and the dimensions of the individual cell, a particular desired elastic wave velocity in a given direction can be obtained.
Inventors
- 👤 Robert B Thompson
- 👤 Donald O Thompson
- 👤 Edgar A Kraut
- 👤 Teong C Lim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:48
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/30; H03H9/36; E; E04; E04B; E04B1/00; E04B1/62; E04B1/74; E04B1/82; E04B1/84; E04B1/86; G; G10; G10K; G10K11/00; G10K11/18; E04B2001/742; E04B2001/748
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
25 words
The method of claim 1 wherein the elastic waves are focused in a preselected pattern by selectively varying the combination of h, 11, and 12.
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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) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |