Patent US3812937A successfully refreshed from Google Patents.
US3812937A
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Damping media for energy absorbing devices
Assignee: Witco Corp
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Filing: 1972-10-04
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Granted: 1974-05-28
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Expires: 1992-10-04
Abstract
Abstract In a hydraulic liquid energy absorbing device for use in low impact bumpers for vehicles, a hydraulic gelled liquid (damping media) comprising a low viscosity petroleum oil, having dispersed therein up to about 20 percent of a modified organophylic montmorillonite (Bentone), and sufficient dispersant such as methanol; said damping media having an unworked penetration of about 225-300 at 77*F. It can contain a small amount of a dispersed polymer such as polybutene, polyisobutene, polybutadiene, polyisoprene, polystyrene, and rubber latex, and the like.
Inventors
- 👤 W Abbott
- 👤 M Rankin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:59
CPC Classifications
B; B60; B60R; B60R19/00; B60R19/02; B60R19/24; B60R19/26; B60R19/32; C; C10; C10M; C10M5/00; C10M7/00; F; F16; F16F; F16F9/00; F16F9/006; C10M2201/00; C10M2201/02; C10M2201/08; C10M2201/082; C10M2201/083; C10M2201/086; C10M2201/14; C10M2205/00; C10M2205/02; C10M2205/026; C10M2205/04; C10M2205/06; C10M2205/20; C10M2207/00; C10M2207/02; C10M2207/021; C10M2207/08; C10M2207/28; C10M2207/32; C10M2215/00; C10M2215/02; C10M2215/04; C10M2215/16; C10M2215/24; C10M2215/26; C10M2219/00; C10M2219/04; C10M2219/044; C10N; C10N2040/00; C10N2040/08; C10N2050/00; C10N2050/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
27 words
An energy absorbing device as in claim 1, wherein said damping media having an unworked penetration in the range of about 240-270 at 77*F., is filled therein.
Claim 2
Dependent Claim
27 words
An energy absorbing device as in claim 1 wherein said organophylic montmorillonite is present in said damping media in the range of about 8-12 percent by weight.
Claim 3
Dependent Claim
28 words
An energy absorbing device as in claim 1 wherein the petroleum oil in said damping media has a viscosity in the range of about 70-80 SUS at 100*F.
Claim 4
Dependent Claim
18 words
An energy absorbing device as in claim 1 wherein the petroleum oil is substantially a naphthenic based oil.
Claim 5
Dependent Claim
13 words
An energy absorbing device as in claim 1 wherein the dispersant is methanol.
Claim 6
Dependent Claim
39 words
An energy absorbing device as in claim 1 wherein said damping media contains about 0.5-1.0 percent by weight, of a polymer selected from the group consisting of polybutene, polyisobutene, polybutadiene, polyisoprene, polystyrene, natural rubber and mixtures thereof, dispersed therein.
Claim 7
Dependent Claim
14 words
An energy absorbing device as in claim 7 wherein said polymer is a latex.
References Cited (Backward Citations)
US3755166A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-27 | 1977-11-26 | 1978-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-27 | 1981-11-26 | 1982-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-27 | 1985-11-26 | 1986-05-28 | $7700.00 | Window Closed / Lapsed |