US3828504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concrete structural member with high internal damping
Assignee: Individual
•
Filing: 1973-04-09
•
Granted: 1974-08-13
•
Expires: 1993-04-09
Abstract
Abstract A concrete structural member comprises at least two elongated concrete elements completely spaced from one another by a continuous intervening layer of viscoelastic material in full surface engagement with each element. The viscoelastic material has a thickness which is a small fraction of the thickness of each element, a modulus of elasticity of 106-108 N/m2, and a loss factor exceeding 0.5.
Inventors
- 👤 B Egerborg
- 👤 G Gadefelt
- 👤 G Hagbjer
- 👤 K Spang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:46
CPC Classifications
B; B32; B32B; B32B13/00; B32B13/04; B32B13/12; E; E04; E04B; E04B1/00; E04B1/62; E04B1/74; E04B1/82; E04B1/84; E04B1/86; E04B1/92; E04B1/98; E04C; E04C3/00; E04C3/02; E04C3/29; E04C3/30; E04C3/36; G; G10; G10K; G10K11/00; G10K11/16; G10K11/162; G10K11/168; B32B2307/00; B32B2307/50; B32B2307/56; B32B2315/00; B32B2315/06; E04B2001/8457; E04B2001/8461; E04B2001/8471
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
88 words
A concrete structural member having high internal damping, said member including at least two concrete elements completely spaced from one another by at least one continuous, intervening layer in full surface engagement with each of said elements and comprising a viscoelastic material operative to absorb essential energy at shearing, said viscoelastic material having a thickness which is a small fraction of the thickness of each of said elements, and said viscoelastic material having a modulus of elasticity of 106 - 108 N/m2 and a loss factor exceeding 0.5.
Claim 2
Dependent Claim
88 words
A concrete structural member having high internal damping, said member including at least two concrete elements completely spaced from one another by at least one continuous, intervening layer in full surface engagement with each of said elements and comprising a viscoelastic material operative to absorb essential energy at shearing, said viscoelastic material having a thickness which is a small fraction of the thickness of each of said elements, and said viscoelastic material having a modulus of elasticity of 106 - 108 N/m2 and a loss factor exceeding 0.5.
Claim 3
Dependent Claim
17 words
The structural member of claim 1 wherein said viscoelastic material has a thickness of substantially 0.1-1 mm.
Claim 4
Dependent Claim
36 words
The structural member of claim 1 wherein said structural member is of elongated configuration and is adapted to be exposed to bending forces, said viscoelastic material being disposed closely adjacent the neutral plane of said member.
Claim 5
Dependent Claim
29 words
The structural member of claim 1 wherein said concrete elements are each of elongated configuration, said layer of viscoelastic material extending throughout substantially the entire length of said member.
Claim 6
Dependent Claim
28 words
The structural member of claim 4 including means for restricting movement of said elongated elements relative to one another in the direction of extension of said intervening layer.
Claim 7
Dependent Claim
33 words
The structural member of claim 5 wherein said means for restricting relative movement engages each of said concrete elements and extends in a direction transverse to the direction of extension of said layer.
Claim 8
Dependent Claim
34 words
The structural member of claim 5 wherein said means for restricting relative movement comprises complementary facing internal portions of said concrete elements extending in directions transverse to the direction of extension of said layer.
Claim 9
Dependent Claim
16 words
The structural member of claim 7 wherein said layer consists of a foil of viscoelastic material.
Claim 10
Dependent Claim
29 words
The structural member of claim 1 wherein said layer is of laminated, sandwich plate construction and comprises a lamination of viscoelastic material disposed between a pair of thin plates.
Claim 11
Dependent Claim
30 words
The structural member of claim 1 wherein said layer comprises a layer of viscoelastic material in engagement with at least one, comparatively stiff layer having a plurality of pores therein.
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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) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |