US4488282A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Damping material
Assignee: RCA Corp
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Filing: 1983-10-26
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Granted: 1984-12-11
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Expires: 2003-10-26
Abstract
Abstract A cured multi-component epoxy composition made from a high molecular weight diglycidyl ether of bisphenol A, a second diglycidyl ether, a high molecular weight polyamide-amine curing agent, and an accelerator, is an excellent damping material and can be used in a cutterhead assembly for the manufacture of high-density information discs.
Inventors
- 👤 Kwong T. Chung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 07:33
CPC Classifications
G; G11; G11B; G11B3/00; G11B3/44; G11B3/46; F; F16; F16F; F16F9/00; F16F9/30; F16F9/306
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
107 words
In a cutterhead assembly comprising a cutting stylus adhered to a piezoelectric element surrounded with a damping material attached to a pedestal and an electrically insulating support, the improvement which comprises using as the damping material a material which is a cured epoxy composition derived from a resin component and a hardener component, wherein the resin component contains a high molecular weight diglycidyl ether of bisphenol A and a diglycidyl ether of a long chain dimer acid and the hardening component comprises a polyamide-amine curing agent and an accelerator and wherein the percent by weight of the hardener component is higher than that of the resin component.
Claim 2
Dependent Claim
107 words
In a cutterhead assembly comprising a cutting stylus adhered to a piezoelectric element surrounded with a damping material attached to a pedestal and an electrically insulating support, the improvement which comprises using as the damping material a material which is a cured epoxy composition derived from a resin component and a hardener component, wherein the resin component contains a high molecular weight diglycidyl ether of bisphenol A and a diglycidyl ether of a long chain dimer acid and the hardening component comprises a polyamide-amine curing agent and an accelerator and wherein the percent by weight of the hardener component is higher than that of the resin component.
Claim 3
Dependent Claim
33 words
An assembly according to claim 1 wherein the resin component contains from 100 to 200 parts by weight of the dimer acid compound per 100 parts by weight of the bisphenol A compound.
Claim 4
Dependent Claim
19 words
An assembly according to claim 1 wherein the dimer acid compound is the diglycidyl ether of linoleic acid dimer.
Claim 5
Dependent Claim
30 words
An assembly according to claim 1 wherein the resin component contains from one to five parts by weight of filler particles per 100 parts by weight of the resin component.
Claim 6
Dependent Claim
29 words
An assembly according to claim 1 wherein the composition contains from one to five parts by weight of pigment particles per 100 parts by weight of the resin component.
Claim 7
Dependent Claim
13 words
An assembly according to claim 1 wherein the accelerator is dibenzyl dimethyl amine.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-12-11 | 1988-06-11 | 1988-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-11 | 1992-06-11 | 1992-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-11 | 1996-06-11 | 1996-12-11 | $7700.00 | Window Closed / Lapsed |