US3087571A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for damping
Assignee: RTX BBN Technologies Corp
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Filing: 1959-05-05
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Granted: 1963-04-30
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Expires: 1979-05-05
Abstract
No abstract record available.
Inventors
- 👤 Jr Edward M Kerwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:23
CPC Classifications
G; G10; G10K; G10K11/00; G10K11/16; G10K11/162; G10K11/168; B; B64; B64C; B64C1/00; B64C1/40; E; E04; E04B; E04B1/00; E04B1/62; E04B1/74; E04B1/82; E04B1/84; F; F16; F16F; F16F9/00; F16F9/30; F16F9/306; E04B2001/742; E04B2001/747; E04B2001/748; E04B2001/8457; E04B2001/8461; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24149; Y10T428/24942; Y10T428/2495; Y10T428/249921; Y10T428/249953; Y10T428/249981; Y10T428/249987; Y10T428/24999
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
160 words
IN COMBINATION WITH A SURFACE SUBJECT TO FLEXURAL MOVEMENTS TO BE DAMPED, A THIN DAMPING LAYER OF MECHANICALLY EXTENSIBLE AND CONSTRACTABLE VISCO-ELASTIC MATERIAL ARRANGED GENERALLY PARALLEL TO SAID SURFACE, A MECHANICALLY STIFF SPACER MUCH THICKER THAN SAID LAYER ARRANGED BETWEEN AND SECURED TO SAID LAYER AND SAID SURFACE FOR COUPLING VIBRATIONS OF SAID SURFACE TO SAID DAMPING LAYER, AND A RELATIVELY INEXTENSIBLE SHEAR-CONSTRAINING LAYER SECURED TO SAID DAMPING LAYER OPPOSITE SAID SPACER AND CAUSING SAID DAMPING LAYER TO SHEAR IN RESPONSE TO SAID VIBRATIONS, THE SHEAR STIFFNESS OF SAID SPACER BEING SUBSTANTIALLY GREATER THAN THAT OF SAID DAMPING LAYER, SAID DAMPING LAYER HAVING A COMPLEX SHEAR MODULUS SUBSTANTIALLY LESS THAN THE SHEAR MODULUS OF SAID SURFACE AND SAID CONSTRAINING LAYER, AND THE EXTENSIONAL STIFFNESS OF SAID SPACER BEING SUBSTANTIALLY LESS THAN THAT OF SAID SURFACE AND SAID CONSTRAINING LAYER, WHEREBY THE MECHANICAL ENERGY LOSSES IN SAID DAMPING LAYER ARE SUBSTANTIALLY GREATER THAN OBTAINABLE IN THE ABSENCE OF SAID STIFF SPACER.
Claim 2
Dependent Claim
160 words
IN COMBINATION WITH A SURFACE SUBJECT TO FLEXURAL MOVEMENTS TO BE DAMPED, A THIN DAMPING LAYER OF MECHANICALLY EXTENSIBLE AND CONSTRACTABLE VISCO-ELASTIC MATERIAL ARRANGED GENERALLY PARALLEL TO SAID SURFACE, A MECHANICALLY STIFF SPACER MUCH THICKER THAN SAID LAYER ARRANGED BETWEEN AND SECURED TO SAID LAYER AND SAID SURFACE FOR COUPLING VIBRATIONS OF SAID SURFACE TO SAID DAMPING LAYER, AND A RELATIVELY INEXTENSIBLE SHEAR-CONSTRAINING LAYER SECURED TO SAID DAMPING LAYER OPPOSITE SAID SPACER AND CAUSING SAID DAMPING LAYER TO SHEAR IN RESPONSE TO SAID VIBRATIONS, THE SHEAR STIFFNESS OF SAID SPACER BEING SUBSTANTIALLY GREATER THAN THAT OF SAID DAMPING LAYER, SAID DAMPING LAYER HAVING A COMPLEX SHEAR MODULUS SUBSTANTIALLY LESS THAN THE SHEAR MODULUS OF SAID SURFACE AND SAID CONSTRAINING LAYER, AND THE EXTENSIONAL STIFFNESS OF SAID SPACER BEING SUBSTANTIALLY LESS THAN THAT OF SAID SURFACE AND SAID CONSTRAINING LAYER, WHEREBY THE MECHANICAL ENERGY LOSSES IN SAID DAMPING LAYER ARE SUBSTANTIALLY GREATER THAN OBTAINABLE IN THE ABSENCE OF SAID STIFF SPACER.
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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) | 1966-04-29 | 1966-10-29 | 1967-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-04-29 | 1970-10-29 | 1971-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-04-29 | 1974-10-29 | 1975-04-30 | $7700.00 | Window Closed / Lapsed |