US3605953A
Expired / Lapsed
US
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Bidirectional damping unit
Assignee: 3M Co
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Filing: 1969-05-26
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Granted: 1971-09-20
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Expires: 1989-05-26
Abstract
Abstract A DAMPING UNIT FOR USE IN A BUILDING STRUCTURE SUBJECT TO SUBSONIC OSCILLATIONS SUCH AS THE WIND MAY INDUCE IN A TALL BUILDING OR STACK OR BRIDGE. THE DAMPING UNIT INCLUDES AT LEAST A PAIR OF RIGID MEMBERS HAIVNG BROAD SURFACES SEPARATED BY A VISCOELASTIC LAYER. THE IMPROVEMENT RESIDES IN TEH VISCOSELASTIC MATERIAL WHICH MAY BE A COPOLYMER OF ACRYLIC MONOMERS SUCH AS A COPOLYMER OF ISOCTYL ACRYLATE AND ACRYLIC ACID. THE VISCOELASTIC LAYER MAY BE ADHERENTLY BONDED TO THE BROAD RIGID SURFACES BY A ROOM-TEMPERATURE-CURING EPOXY TESIN COMPOSITION.
Inventors
- 👤 Donald B Caldwell
- 👤 Carl A Dahlquist
- 👤 Robert L Elton
- 👤 Leslie E Robertson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:00
CPC Classifications
E; E04; E04B; E04B1/00; E04B1/62; E04B1/92; E04B1/98; F; F16; F16F; F16F1/00; F16F1/36; F16F1/42; F16F1/50; F16F2236/00; F16F2236/10
Claims Analysis
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References Cited (Backward Citations)
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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) | 1974-09-19 | 1975-03-21 | 1975-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-19 | 1979-03-21 | 1979-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-19 | 1983-03-21 | 1983-09-20 | $7700.00 | Window Closed / Lapsed |