US3290447A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for splitting crosspoints of a crossbar switch
Assignee: Hitachi Ltd
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Filing: 1963-04-23
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Granted: 1966-12-06
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Expires: 1983-04-23
Abstract
No abstract record available.
Inventors
- 👤 Ohno Toru
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:27
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/0004
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
IN A CROSSBAR SWITCHING SYSTEM COMPRISED BY FIRST AND SECOND SETS OF CROSSBAR SWITCHES WITH THE SECOND SET OF CROSSBAR SWITCHES PROVIDING A CROSSPOINT SPLITTING FUNCTION AND WHEREIN THE TOTAL NUMBER OF VERTICAL SWITCHING UNITS IN THE SECOND SET OF CROSSBAR SWITCHES IS EQUAL TO THE TOTAL NUMBER OF VERTICAL SWITCHING UNITS IN THE FIRST SET OF CROSSBAR SWITCHES, THE IMPROVEMENT COMPRISING MEANS OF CONNECTING FOUR HORIZONTAL LEVEL SWITCHING UNITS IN EACH VERTICAL UNIT OF SAID SECOND SET OF CROSSBAR SWITCHES FOR SPLITTING OF CROSSPOINTS, MEANS FOR CONNECTING THE REMAINING HORIZONTAL LEVEL SWITCHING UNITS IN THE SECOND SET OF CROSSBAR SWITCHES FOR ORDINARY CROSSBAR SWITCHING CONNEC-
Claim 2
Dependent Claim
106 words
IN A CROSSBAR SWITCHING SYSTEM COMPRISED BY FIRST AND SECOND SETS OF CROSSBAR SWITCHES WITH THE SECOND SET OF CROSSBAR SWITCHES PROVIDING A CROSSPOINT SPLITTING FUNCTION AND WHEREIN THE TOTAL NUMBER OF VERTICAL SWITCHING UNITS IN THE SECOND SET OF CROSSBAR SWITCHES IS EQUAL TO THE TOTAL NUMBER OF VERTICAL SWITCHING UNITS IN THE FIRST SET OF CROSSBAR SWITCHES, THE IMPROVEMENT COMPRISING MEANS OF CONNECTING FOUR HORIZONTAL LEVEL SWITCHING UNITS IN EACH VERTICAL UNIT OF SAID SECOND SET OF CROSSBAR SWITCHES FOR SPLITTING OF CROSSPOINTS, MEANS FOR CONNECTING THE REMAINING HORIZONTAL LEVEL SWITCHING UNITS IN THE SECOND SET OF CROSSBAR SWITCHES FOR ORDINARY CROSSBAR SWITCHING CONNEC-
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) | 1969-12-05 | 1970-06-06 | 1970-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-05 | 1974-06-06 | 1974-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-05 | 1978-06-06 | 1978-12-06 | $7700.00 | Window Closed / Lapsed |