Patent US4734680A successfully refreshed from Google Patents.
US4734680A
Expired / Lapsed
US
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Detection system with randomized transmissions
Assignee: Emhart Industries Inc
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Filing: 1986-02-06
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Granted: 1988-03-29
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Expires: 2006-02-06
Abstract
Abstract A detection system having sending units for sending data signals representative of a condition, such as fire, smoke, intrusion, battery condition, or an emergency, to a central receiving unit. The sending units include a microcomputer which generates a pseudo-random number, waits for a number of cycle periods equal to the pseudo-random number, then activates a transmitter to send a data signal to the receiving unit. The randomized transmission prevents the synchronized clashing of transmitters.
Inventors
- 👤 Stacy E. Gehman
- 👤 Kevin T. Ruddell
- 👤 Brian D. Dawson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:16
CPC Classifications
G; G08; G08B; G08B29/00; G08B29/12; G08B29/14; G08B25/00; G08B25/01; G08B25/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
115 words
A detection system comprising: a plurality of sending units, each of said units comprising: sensing means for sensing a condition; means for generating a pseudo-random number; means responsive to said sensing means and said means for generating for sending a data signal representative of said condition at pseudo-randomized time intervals, said means including a means for cycling through a number of timing loops in a microprocessor program equal to said pseudo-random number before outputting said data, and a means for delaying the sending of said data signal for a predetermined time interval in addition to the pseudo-random time interval; and receiving means for receiving said data signals and producing an output indicative of said condition.
Claim 2
Dependent Claim
115 words
A detection system comprising: a plurality of sending units, each of said units comprising: sensing means for sensing a condition; means for generating a pseudo-random number; means responsive to said sensing means and said means for generating for sending a data signal representative of said condition at pseudo-randomized time intervals, said means including a means for cycling through a number of timing loops in a microprocessor program equal to said pseudo-random number before outputting said data, and a means for delaying the sending of said data signal for a predetermined time interval in addition to the pseudo-random time interval; and receiving means for receiving said data signals and producing an output indicative of said condition.
Claim 3
Independent Claim
68 words
A method of providing an indication of a condition at a remote location comprising: sensing said condition; generating a pseudo-random number; cycling through a timing loop in a microprocessor program a number of times equal to said pseudo-random number; waiting for a predetermined time interval; sending a data signal representative of said condition; and receiving said data signal and utilizing it to provide an indication of said condition.
Claim 4
Independent Claim
68 words
A method of providing an indication of a condition at a remote location comprising: sensing said condition; generating a pseudo-random number; cycling through a timing loop in a microprocessor program a number of times equal to said pseudo-random number; waiting for a predetermined time interval; sending a data signal representative of said condition; and receiving said data signal and utilizing it to provide an indication of said condition.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-03-29 | 1991-09-28 | 1992-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-29 | 1995-09-28 | 1996-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-29 | 1999-09-28 | 2000-03-29 | $7700.00 | Window Closed / Lapsed |