Patent US3761660A successfully refreshed from Google Patents.
US3761660A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arc interrupting composition and apparatus
Assignee: ROSTONE ACQUISITION Corp
•
Filing: 1972-10-20
•
Granted: 1973-09-25
•
Expires: 1992-10-20
Abstract
Abstract An arc interrupting composition for the arc-exposure walls or surfaces of electric circuit interrupting devices. The composition comprises a combination of hydrated alumina and melamine in a binder which may be a thermosetting resin but is preferably a thermoplastic resin which is more reactive to arcing than the melamine. Under arcing conditions, it is believed the binder vaporizes or decomposes violently and the hydrated alumina gives off water of hydration, and that these effects interact to render the melamine more effective and to create improved arc interruption conditions and service life.
Inventors
- 👤 P Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:42
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/002; H01B3/006; H01H; H01H33/00; H01H33/70; H01H33/76
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
61 words
A new arc interrupting composition consisting essentially of melamine, hydrated alumina, and a binder, each 100 parts by weight of said components containing binder in an amount from 10 parts to 50 parts, melamine in an amount of at least 10 parts, and hydrated alumina in an amount in the range of from about 1 part up to about 70 parts.
Claim 2
Dependent Claim
61 words
A new arc interrupting composition consisting essentially of melamine, hydrated alumina, and a binder, each 100 parts by weight of said components containing binder in an amount from 10 parts to 50 parts, melamine in an amount of at least 10 parts, and hydrated alumina in an amount in the range of from about 1 part up to about 70 parts.
Claim 3
Dependent Claim
15 words
An arc interrupting composition as in claim 1 wherein the binder is a thermoplastic resin.
Claim 4
Dependent Claim
15 words
An arc interrupting composition as in claim 1 wherein the binder is a polyethylene resin.
Claim 5
Dependent Claim
32 words
An arc interrupting component for an electrical circuit interrupter, comrising a molded body defining an arc exposure surface and composed at such surface of an arc-interrupting composition as defined in claim 1.
Claim 6
Dependent Claim
33 words
An electrical circuit interrupting device, comprising an insulating body defining a surface across which an electric arc can occur, and composed at such surface of an arc-interrupting composition as defined in claim 1.
Claim 7
Dependent Claim
26 words
An arc interrupting device as in claim 5 in which said arc-interrupting composition is present as a surface layer on an insulating body of other composition.
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) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |