US4847593A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transmission circuit of fire protection/security system
Assignee: Nohmi Bosai Ltd
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Filing: 1987-05-18
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Granted: 1989-07-11
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Expires: 2007-05-18
Abstract
Abstract A transmission circuit is disposed in at least one of a control panel and a plurality of terminal devices of a fire protection/security system, wherein the control panel individually polls the terminal devices to read in terminal information from the terminal devices, to judge and/or display the information, or to control the terminal devices. The transmission circuit includes a signal sending device for sending a signal to a signal line, a memory device for storing a signal to be sent to the signal line, and a coincidence decision device for deciding a coincidence between the signal sent from the signal sending device and the signal stored in the memory device.
Inventors
- 👤 Akira Igarashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:02
CPC Classifications
G; G08; G08B; G08B25/00; G08B25/01; G08B25/04; G08B26/00; G08B26/001; G08B26/002; G08B29/00; G08B29/18
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
108 words
A transmission circuit, said transmission circuit disposed in at least one of a control panel and a plurality of terminal devices of a fire protection/security system, wherein said control panel individually polls said plurality of terminal devices, said transmission circuit comprising: a signal sending means for sending a signal to be transmitted to a signal line; a memory means for storing said signal to be transmitted; a coincidence decision means, coupled to an output of said signal sending means and to said memory means, for comparing said signal to be transmitted sent from said signal sending means with said signal to be transmitted stored in said memory means.
Claim 2
Dependent Claim
108 words
A transmission circuit, said transmission circuit disposed in at least one of a control panel and a plurality of terminal devices of a fire protection/security system, wherein said control panel individually polls said plurality of terminal devices, said transmission circuit comprising: a signal sending means for sending a signal to be transmitted to a signal line; a memory means for storing said signal to be transmitted; a coincidence decision means, coupled to an output of said signal sending means and to said memory means, for comparing said signal to be transmitted sent from said signal sending means with said signal to be transmitted stored in said memory means.
Claim 3
Dependent Claim
33 words
A transmission circuit as claimed in claim 1, wherein said coincidence decision means comprises a means to stop a sending of a signal when said compared signals to be transmitted are not identical.
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) | 1992-07-10 | 1993-01-09 | 1993-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-10 | 1997-01-09 | 1997-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-10 | 2001-01-09 | 2001-07-11 | $7700.00 | Window Closed / Lapsed |