Patent US1930523A successfully refreshed from Google Patents.
US3909561A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit use warning device
Assignee: Badger Meter Inc
•
Filing: 1974-03-18
•
Granted: 1975-09-30
•
Expires: 1994-03-18
Abstract
Abstract The disclosure is a circuit use warning device particularly for telephonic installation which includes a voice communication circuit and a test circuit that can be connected and disconnected for exchange of signals. There is a warning signal emitter included in the device to furnish warning signals to the voice communication circuit. There is also an arrangement for withholding the warning signal for a predetermined time after the test circuit has been connected to the voice communication circuit.
Inventors
- 👤 Barry H Dent
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:59
CPC Classifications
H; H04; H04M; H04M3/00; H04M3/22; H04M3/26; H04M3/28; H04M3/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
In a circuit use warning device comprising a voice communication circuit, a test circuit, selector means for connecting said test circuit to said voice communication circuit and a warning signal emitter, the improvement comprising means for connecting said emitter in said test circuit to furnish warning signals to said communication circuit, and means responsive to operation of said selector means for withholding said signals for a predetermined time after operation of said selector means.
Claim 2
Dependent Claim
74 words
In a circuit use warning device comprising a voice communication circuit, a test circuit, selector means for connecting said test circuit to said voice communication circuit and a warning signal emitter, the improvement comprising means for connecting said emitter in said test circuit to furnish warning signals to said communication circuit, and means responsive to operation of said selector means for withholding said signals for a predetermined time after operation of said selector means.
References Cited (Backward Citations)
US3544735A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |