Patent JPS5915641A successfully refreshed from Google Patents.
US3514852A
Expired / Lapsed
US
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Method of making artificial telephone lines impedance matching networks
Assignee: International Standard Electric Corp
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Filing: 1967-11-01
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Granted: 1970-06-02
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Expires: 1987-11-01
Abstract
No abstract record available.
Inventors
- 👤 Frank Ralph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:55
CPC Classifications
H; H01; H01P; H01P3/00; G; G06; G06G; G06G7/00; G06G7/48; G06G7/62; H04; H04B; H04B3/00; H04B3/02; H04B3/40; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49101
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB544144A
Cited
US3160801A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-06-01 | 1973-12-01 | 1974-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-01 | 1977-12-01 | 1978-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-01 | 1981-12-01 | 1982-06-02 | $7700.00 | Window Closed / Lapsed |