US3301964A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for releasing magnetic latching crossbar switches in which hold magnets are interconnected over crosspoint contacts of the preceding switch
Assignee: AT&T Inc
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Filing: 1963-12-09
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Granted: 1967-01-31
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Expires: 1983-12-09
Abstract
No abstract record available.
Inventors
- 👤 Edson L Erwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:19
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/0004
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
A TELEPHONE CROSSBAR SWITCHING SYSTEM INCLUDING A PLURALITY OF TANDEMLY CONNECTED SWITCHING STAGES, EACH OF SAID STAGES INCLUDING A PLURALITY OF CROSSPOINT CONTACTS, NORMALLY DEFLUXED MAGNETIC ACTUATING MEANS FOR SELECTIVELY OPERATING SAID CONTACTS AND FOR MAGNETICALLY LATCHING SAID CONTACTS IN THE OPERATED CONDITION, AND MEANS FOR DELIVERING A RELEASE CURRENT TO ALL OF SAID MAGNETIC MEANS TO DEFLUX SAID MAGNETIC MEANS PRIOR TO THE RELEASE OF SAID CONTACTS.
Claim 2
Dependent Claim
68 words
A TELEPHONE CROSSBAR SWITCHING SYSTEM INCLUDING A PLURALITY OF TANDEMLY CONNECTED SWITCHING STAGES, EACH OF SAID STAGES INCLUDING A PLURALITY OF CROSSPOINT CONTACTS, NORMALLY DEFLUXED MAGNETIC ACTUATING MEANS FOR SELECTIVELY OPERATING SAID CONTACTS AND FOR MAGNETICALLY LATCHING SAID CONTACTS IN THE OPERATED CONDITION, AND MEANS FOR DELIVERING A RELEASE CURRENT TO ALL OF SAID MAGNETIC MEANS TO DEFLUX SAID MAGNETIC MEANS PRIOR TO THE RELEASE OF SAID CONTACTS.
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) | 1970-01-30 | 1970-08-01 | 1971-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-30 | 1974-08-01 | 1975-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-30 | 1978-08-01 | 1979-01-31 | $7700.00 | Window Closed / Lapsed |