Patent US3229040A successfully refreshed from Google Patents.
US3229040A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone exchange systems
Assignee: Associated Electrical Industries Ltd
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Filing: 1962-02-19
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Granted: 1966-01-11
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Expires: 1982-02-19
Abstract
No abstract record available.
Inventors
- 👤 Drake Bernard
- 👤 Smith Sydney Francis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:39
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/0016; H01; H01H; H01H1/00; H01H1/60; H01H1/605
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
IN A TELEPHONE EXCHANGE SYSTEM A SWITCHING ARRANGEMENT COMPRISING A TRANSMISSION PATH HAVING AT LEAST ONE PAIR OF CONDUCTORS, SWITCHING CONTACTS CONNECTED IN SAID CONDUCTORS, MEANS FOR APPLYING DIFFERENT POTENTIALS TO THE TRANSMISSION PATH ON RESPECTIVE SIDES OF SAID CONTACTS FOR PRODUCING A CURRENT THROUGH SAID CONTACTS WHEN CLOSED, AND VOLTAGE SURGE-PRODUCING MEANS CONNECTABLE TO THE TRANSMISSION PATH FOR APPLYING A VOLTAGE SURGE THROUGH SAID CONDUCTORS FOR EFFECTING BREAKDOWN OF HIGH RESISTANCE FILMS ON SAID CONTACTS, TRANSFORMERS HAVING CENTER-TAPPED TRANSFORMER WINDINGS OF SAID TRANSFORMERS CONNECTED BETWEEN A PAIR OF CONDUCTORS ON THE RESPECTIVE SIDES OF THE SWITCHING CONTACTS AND CENTER TAPS ON SAID WINDINGS CONNECTED, RESPECTIVELY, TO THE VOLTAGE SURGEPRODUCING MEANS.
Claim 2
Dependent Claim
111 words
IN A TELEPHONE EXCHANGE SYSTEM A SWITCHING ARRANGEMENT COMPRISING A TRANSMISSION PATH HAVING AT LEAST ONE PAIR OF CONDUCTORS, SWITCHING CONTACTS CONNECTED IN SAID CONDUCTORS, MEANS FOR APPLYING DIFFERENT POTENTIALS TO THE TRANSMISSION PATH ON RESPECTIVE SIDES OF SAID CONTACTS FOR PRODUCING A CURRENT THROUGH SAID CONTACTS WHEN CLOSED, AND VOLTAGE SURGE-PRODUCING MEANS CONNECTABLE TO THE TRANSMISSION PATH FOR APPLYING A VOLTAGE SURGE THROUGH SAID CONDUCTORS FOR EFFECTING BREAKDOWN OF HIGH RESISTANCE FILMS ON SAID CONTACTS, TRANSFORMERS HAVING CENTER-TAPPED TRANSFORMER WINDINGS OF SAID TRANSFORMERS CONNECTED BETWEEN A PAIR OF CONDUCTORS ON THE RESPECTIVE SIDES OF THE SWITCHING CONTACTS AND CENTER TAPS ON SAID WINDINGS CONNECTED, RESPECTIVELY, TO THE VOLTAGE SURGEPRODUCING MEANS.
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) | 1969-01-10 | 1969-07-12 | 1970-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-10 | 1973-07-12 | 1974-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-10 | 1977-07-12 | 1978-01-11 | $7700.00 | Window Closed / Lapsed |