US3234537A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fire detection system
Assignee: Individual
•
Filing: 1964-05-05
•
Granted: 1966-02-08
•
Expires: 1984-05-05
Abstract
No abstract record available.
Inventors
- 👤 John E Lindberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:00
CPC Classifications
G; G08; G08B; G08B17/00; G08B17/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
152 words
A TEMPERATURE DETECTION SYSTEM INCLUDING IN COMBINATION: A SOURCE OF ELECTRICAL POWER, AN ELECTRICALLY ACTUATED SIGNAL DEVICE IN SERIES WITH SAID SOURCE, LOW-RESISTANCE SHUNT MEANS AROUND SAID SIGNAL DEVICE TO PREVENT ACTUATION THEREOF WHEN THE POWER IS ON, NORMALLY CLOSED FREELY OPENABLE AND RECLOSABLE SWITCH MEANS IN SAID SHUNT MEANS FOR OPENING SAID SHUNT MEANS, A TEMPERATURE DETECTOR CONNECTED TO SAID SWITCH MEANS FOR CAUSING IT TO OPEN SAID SHUNT MEANS AT ANY TIME A PREDETERMINED CRITICAL TEMPERATURE IS ATTAINED BY SAID DETECTOR, SAID SHUNT MEANS BEING CLOSED AGAIN WHEN SAID DETECTOR TEMPERATURE DROPS BELOW THE CRITICAL VALUE, AND A SECOND NORMALLY OPEN SWITCH MEANS IN SERIES WITH SAID POWER SOURCE AND SAID SIGNAL DEVICE, CONNECTED TO SAID TEMPERATURE DETECTOR FOR ACTUATION THEREBY, BEING CLOSED THEREBY AT SAID PREDETERMINED CRITICAL TEMPERATURE, BOTH CLOSURE OF SAID SECOND SWITCH MEANS AND OPENING OF SAID SHUNT MEANS BEING REQUIRED FOR ACTUATION OF SAID SIGNAL DEVICE.
Claim 2
Dependent Claim
152 words
A TEMPERATURE DETECTION SYSTEM INCLUDING IN COMBINATION: A SOURCE OF ELECTRICAL POWER, AN ELECTRICALLY ACTUATED SIGNAL DEVICE IN SERIES WITH SAID SOURCE, LOW-RESISTANCE SHUNT MEANS AROUND SAID SIGNAL DEVICE TO PREVENT ACTUATION THEREOF WHEN THE POWER IS ON, NORMALLY CLOSED FREELY OPENABLE AND RECLOSABLE SWITCH MEANS IN SAID SHUNT MEANS FOR OPENING SAID SHUNT MEANS, A TEMPERATURE DETECTOR CONNECTED TO SAID SWITCH MEANS FOR CAUSING IT TO OPEN SAID SHUNT MEANS AT ANY TIME A PREDETERMINED CRITICAL TEMPERATURE IS ATTAINED BY SAID DETECTOR, SAID SHUNT MEANS BEING CLOSED AGAIN WHEN SAID DETECTOR TEMPERATURE DROPS BELOW THE CRITICAL VALUE, AND A SECOND NORMALLY OPEN SWITCH MEANS IN SERIES WITH SAID POWER SOURCE AND SAID SIGNAL DEVICE, CONNECTED TO SAID TEMPERATURE DETECTOR FOR ACTUATION THEREBY, BEING CLOSED THEREBY AT SAID PREDETERMINED CRITICAL TEMPERATURE, BOTH CLOSURE OF SAID SECOND SWITCH MEANS AND OPENING OF SAID SHUNT MEANS BEING REQUIRED FOR ACTUATION OF SAID SIGNAL DEVICE.
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) | 1969-02-07 | 1969-08-09 | 1970-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-07 | 1973-08-09 | 1974-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-07 | 1977-08-09 | 1978-02-08 | $7700.00 | Window Closed / Lapsed |