Patent US874219A successfully refreshed from Google Patents.
Patent US3352974A successfully refreshed from Google Patents.
US3352974A
Expired / Lapsed
US
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Traffic load detecting arrangement
Assignee: AT&T Inc
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Filing: 1965-01-19
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Granted: 1967-11-14
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Expires: 1985-01-19
Abstract
No abstract record available.
Inventors
- 👤 Minchenko George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:32
CPC Classifications
H; H04; H04M; H04M3/00; H04M3/22; H04M3/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
AN ARRANGEMENT FO RASCERTAINING THE OCCUPANCY OF UNITS OF EQUIPMENT COMPRISING AN IMPEDANCE NETWORK, MEANS CONTROLLED BY SAID EQUIPMENT FOR CHANGING THE IMPEDANCE OF SAID NETWORK IN ACCORDANCE WITH THE NUMBER OF OCCUPIED EQUIPMENT UNITS, A FIRST TRIGGER CIRCUIT OPERATED IN RESPONSE TO A FIRST IMPEDANCE CHANGE IN SAID NETWORK WHEN A FIRST PREDETERMINED NUMBER OF SAID UNITS ARE OCCUPIED, A SECOND TRIGGER OPERATED IN RESPONSE TO A SECOND IMPEDANCE CHANGE IN SAID NETWORK WHEN A SECOND PREDETERMINED NUMBER OF SAID UNITS OCCUPIED, AND CONTROL MEANS EFFECTED WHEN SAID FIRST TRIGGER CIRCUIT IS OPERATED IN RESPONSE TO SAID FIRST IMPEDANCE CHANGE FOR ALTERNATELY CONNECTING SAID FIRST AND SECOND TRIGGER CIRCUITS TO SAID NETWORK.
Claim 2
Dependent Claim
113 words
AN ARRANGEMENT FO RASCERTAINING THE OCCUPANCY OF UNITS OF EQUIPMENT COMPRISING AN IMPEDANCE NETWORK, MEANS CONTROLLED BY SAID EQUIPMENT FOR CHANGING THE IMPEDANCE OF SAID NETWORK IN ACCORDANCE WITH THE NUMBER OF OCCUPIED EQUIPMENT UNITS, A FIRST TRIGGER CIRCUIT OPERATED IN RESPONSE TO A FIRST IMPEDANCE CHANGE IN SAID NETWORK WHEN A FIRST PREDETERMINED NUMBER OF SAID UNITS ARE OCCUPIED, A SECOND TRIGGER OPERATED IN RESPONSE TO A SECOND IMPEDANCE CHANGE IN SAID NETWORK WHEN A SECOND PREDETERMINED NUMBER OF SAID UNITS OCCUPIED, AND CONTROL MEANS EFFECTED WHEN SAID FIRST TRIGGER CIRCUIT IS OPERATED IN RESPONSE TO SAID FIRST IMPEDANCE CHANGE FOR ALTERNATELY CONNECTING SAID FIRST AND SECOND TRIGGER CIRCUITS TO SAID NETWORK.
References Cited (Backward Citations)
US2024275A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-11-13 | 1971-05-15 | 1971-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-13 | 1975-05-15 | 1975-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-13 | 1979-05-15 | 1979-11-14 | $7700.00 | Window Closed / Lapsed |