Patent US3906932A successfully refreshed from Google Patents.
US3087573A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Damping structure
Assignee: RTX BBN Technologies Corp
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Filing: 1959-08-10
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Granted: 1963-04-30
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Expires: 1979-08-10
Abstract
No abstract record available.
Inventors
- 👤 Ross Donald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:22
CPC Classifications
E; E04; E04B; E04B1/00; E04B1/62; E04B1/74; E04B1/82; E04B1/84; E04B1/86; G; G10; G10K; G10K11/00; G10K11/16; G10K11/162; G10K11/168; E04B2001/742; E04B2001/748; E04B2001/8457; E04B2001/8461
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
155 words
IN COMBINATION WITH A SURFACE SUBJECT TO FLEXURAL MOVEMENTS TO BE DAMPED, A THIN DAMPING LAYER OF MECHANICALLY EXTENSIBLE AND CONTRACTABLE VISCO-ELASTIC MATERIAL SECURED TO A MECHANICALLY STIFF SPACER MUCH THICKER THAN SAID LAYER, AND A RELATIVELY INEXTENSIBLE SHEAR-CONSTRAINING LAYER, SAID DAMPING LAYER, SAID SPACER, AND SAID SHEAR-CONSTRAINING LAYER BEING ARRANGED GENERALLY PARALLEL TO SAID SURFACE WITH SAID DAMPING LAYER AND SAID SPACER SECURED BETWEEN SAID SURFACE AND SAID SHEAR-CONSTRAINING LAYER, SAID SHEAR-CONSTRAINING LAYER CAUSING SAID DAMPING LAYER TO SHEAR IN RESPONSE TO SAID MOVEMENTS, 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, SAID SURFACE, DAMPING LAYER, SPACER, AND SHEAR-CONSTRAINING LAYER BEING GEOMETRICALLY PROPORTIONED TO SATISFY THE RELATIONSHIP:
Claim 2
Dependent Claim
155 words
IN COMBINATION WITH A SURFACE SUBJECT TO FLEXURAL MOVEMENTS TO BE DAMPED, A THIN DAMPING LAYER OF MECHANICALLY EXTENSIBLE AND CONTRACTABLE VISCO-ELASTIC MATERIAL SECURED TO A MECHANICALLY STIFF SPACER MUCH THICKER THAN SAID LAYER, AND A RELATIVELY INEXTENSIBLE SHEAR-CONSTRAINING LAYER, SAID DAMPING LAYER, SAID SPACER, AND SAID SHEAR-CONSTRAINING LAYER BEING ARRANGED GENERALLY PARALLEL TO SAID SURFACE WITH SAID DAMPING LAYER AND SAID SPACER SECURED BETWEEN SAID SURFACE AND SAID SHEAR-CONSTRAINING LAYER, SAID SHEAR-CONSTRAINING LAYER CAUSING SAID DAMPING LAYER TO SHEAR IN RESPONSE TO SAID MOVEMENTS, 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, SAID SURFACE, DAMPING LAYER, SPACER, AND SHEAR-CONSTRAINING LAYER BEING GEOMETRICALLY PROPORTIONED TO SATISFY THE RELATIONSHIP:
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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 |