US3571798A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two level switching system
Assignee: International Business Machines Corp
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Filing: 1968-11-13
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Granted: 1971-03-23
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Expires: 1988-11-13
Abstract
Abstract A two level switching system to be used in communications systems, comprising a first means for placing a plurality of input lines in a Hold Mode of operation, a second means for maintaining a plurality of input lines in an Operating Mode of operation, and means for connecting and disconnecting input lines in an Operating Mode of operation into a Hold Mode of operation at the initiation of the user or of the system itself.
Inventors
- 👤 Glenn E Dawson
- 👤 Michael Teig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:59
CPC Classifications
G; G06; G06F; G06F13/00; G06F13/38; G06F13/40; G06F13/4004; G06F13/4022
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
187 words
A two-level switching system comprising; m input lines; n output lines, where m is greater than n; a holding means capable of holding each of said m input lines; a first connecting means for connecting any of said m input lines to said holding means; a second connecting means for individually connecting any number p of said m input lines to any of individual ones of number p of said n output lines where the maximum value of p is n; a first transfer means for transferring any of said m input lines being held by said holding means to said second connecting means, said second connecting means connecting the input lines transferred thereto to individual ones of said output lines; a second transfer means for transferring any of said m input lines connected to said n output lines by said second connecting means to said first connecting means, said first connecting means connecting the input lines transferred thereto to said holding means; and a control means for controlling the transferring of said m input lines by said first transfer means and by said second transfer means.
Claim 2
Dependent Claim
187 words
A two-level switching system comprising; m input lines; n output lines, where m is greater than n; a holding means capable of holding each of said m input lines; a first connecting means for connecting any of said m input lines to said holding means; a second connecting means for individually connecting any number p of said m input lines to any of individual ones of number p of said n output lines where the maximum value of p is n; a first transfer means for transferring any of said m input lines being held by said holding means to said second connecting means, said second connecting means connecting the input lines transferred thereto to individual ones of said output lines; a second transfer means for transferring any of said m input lines connected to said n output lines by said second connecting means to said first connecting means, said first connecting means connecting the input lines transferred thereto to said holding means; and a control means for controlling the transferring of said m input lines by said first transfer means and by said second transfer means.
Claim 3
Dependent Claim
31 words
A two-level switching system as set forth in claim 1 further including a priority means for determining the relative priority of said m input lines being held by said holding means.
Claim 4
Dependent Claim
41 words
A two-level switching system as set forth in claim 1, further comprising; a business equipment means being connected to at least one of said n output lines; and an interface means for connecting said business equipment means to said control means.
Claim 5
Dependent Claim
41 words
A two-level switching system as set forth in claim 2, further comprising: a business equipment means being connected to at least one of said n output lines; and an interface means for connecting said business equipment means to said control means.
Claim 6
Dependent Claim
65 words
A two-level switching system as set forth in claims 1, 2, 3, or 4, wherein said holding means comprises: a first holding means for holding each of said m input lines prior to being transferred by said first transfer means to said second connecting means; and a second holding means for holding each of said m input lines being transferred by said second transfer means.
Claim 7
Dependent Claim
75 words
A two-level switching system as set forth in claims 2 or 4, wherein said priority means comprises: a first priority means for determining the relative priority between said first holding means and said second holding means; a second priority means for determining the relative priority between said m input lines in said first holding means; and a third priority means for determining the relative priority between said m input lines in said second holding means.
Claim 8
Dependent Claim
60 words
A two-level switching system as set forth in claim 5, wherein said control means comprises: a detecting means for determining the availability of each of said n output lines; and an initiating means for initiating the transfer of said m input lines being held by said holding means, said initiating means being responsive to a plurality of sources of commands.
Claim 9
Dependent Claim
32 words
A two-level switching system as set forth in claim 7 wherein said business equipment means is one of said plurality of sources of commands to said initiating means of said control means.
References Cited (Backward Citations)
US3299210A
Cited
US3300758A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-22 | 1974-09-21 | 1975-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-22 | 1978-09-21 | 1979-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-22 | 1982-09-21 | 1983-03-23 | $7700.00 | Window Closed / Lapsed |