US3602770A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Distributed r-c networks using metallized plastic film
Assignee: AT&T Inc
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Filing: 1970-03-03
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Granted: 1971-08-31
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Expires: 1990-03-03
Abstract
Abstract This disclosure describes several distributed R-C components structures characterized principally by a floating electrode to which an electrical connection is directly made. These structures typically comprise alternate layers of plastic and metal or metallized plastic strips. The structures are shown to be advantageous in telephone relay contact protection application.
Inventors
- 👤 William Mcmahon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:56
CPC Classifications
H; H01; H01H; H01H9/00; H01H9/54; H01G; H01G4/00; H01G4/40
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
158 words
In combination: a telephone central office relay comprising an inductive coil and means including contacts for energizing said coil, and a network for protecting said contacts from arcing, comprising, an elongated plastic strip having a thin metallic coating on one side thereof, said coating having a resistivity of from 1100 ohms per square; a first elongated metallic foil registered over a first end of said metallic coating and protruding beyond the upper edge thereof; a second elongated elongated metallic foil registered over the opposite end of said metallic cOating and substantially separated from said first metallic foil, said second foil protruding beyond the lower edge of said metallic coating; means insulating said metallic coating from each said metal foil; means including the respective protruding edges of said first and second metallic foils for connecting said network across said coil; and said network characterized in that its effective impedance as measured across said protruding edges decreases with increasing frequency.
Claim 2
Dependent Claim
158 words
In combination: a telephone central office relay comprising an inductive coil and means including contacts for energizing said coil, and a network for protecting said contacts from arcing, comprising, an elongated plastic strip having a thin metallic coating on one side thereof, said coating having a resistivity of from 1100 ohms per square; a first elongated metallic foil registered over a first end of said metallic coating and protruding beyond the upper edge thereof; a second elongated elongated metallic foil registered over the opposite end of said metallic cOating and substantially separated from said first metallic foil, said second foil protruding beyond the lower edge of said metallic coating; means insulating said metallic coating from each said metal foil; means including the respective protruding edges of said first and second metallic foils for connecting said network across said coil; and said network characterized in that its effective impedance as measured across said protruding edges decreases with increasing frequency.
Claim 3
Dependent Claim
50 words
The combination of claim 1, wherein said elongated plastic strip is continuous and is substantially narrower in width than said means insulating said metallic coating, the said insulating means being so registered with said strip that its longitudinal edges extend at all points beyond the edges of said metallic coating.
Claim 4
Dependent Claim
44 words
The combination of claim 1, wherein said metallic coating comprises evaporated aluminum, wherein said first and second metallic foils are comprised of tin, and wherein said plastic strip and said insulating means are comprised of a polyester of terephthalic acid condensed with ethylene glycol.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-30 | 1975-03-01 | 1975-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-30 | 1979-03-01 | 1979-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-30 | 1983-03-01 | 1983-08-31 | $7700.00 | Window Closed / Lapsed |