US2804610A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fire alarm system
Assignee: Individual
•
Filing: 1956-07-03
•
Granted: 1957-08-27
•
Expires: 1976-07-03
Abstract
No abstract record available.
Inventors
- 👤 Roger W Curtis
- 👤 Kaplan Nathan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:37
CPC Classifications
G; G08; G08B; G08B17/00; G08B17/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
A FIRE ALARM SYSTEM COMPRISING AN ALONGATED THERMAL ELECTRIC CELL DETECTOR HAVING ELECTRICAL INDICATING MEANS IN CURRENT CONDUCTING RELATIONSHIP THEREWITH, SAID DETECTOR COMPRISING AN OUTER ELECTRODE OF A FIRST METALLIC ELEMENT, AN INNER ELECTRODE OF A SECOND DISSIMILAR METALLIC ELEMENT, NONCONDUCTIVE SPACING MEANS DISPOSED THEREBETWEEN AND A FUSIBLE SALT ELECTROLYTE INTERSPERSED WITH SAID SPACER, SAID ELECTROLYTE ADAPTED TO MELT AT A PREDETERMINED TEMPERATURE AND TO COOPERATE WITH THE ELECTORDES TO PRODUCE A CURRENT ADAPTED TO ACTUATE THE INDICATING MEANS.
Claim 2
Dependent Claim
79 words
A FIRE ALARM SYSTEM COMPRISING AN ALONGATED THERMAL ELECTRIC CELL DETECTOR HAVING ELECTRICAL INDICATING MEANS IN CURRENT CONDUCTING RELATIONSHIP THEREWITH, SAID DETECTOR COMPRISING AN OUTER ELECTRODE OF A FIRST METALLIC ELEMENT, AN INNER ELECTRODE OF A SECOND DISSIMILAR METALLIC ELEMENT, NONCONDUCTIVE SPACING MEANS DISPOSED THEREBETWEEN AND A FUSIBLE SALT ELECTROLYTE INTERSPERSED WITH SAID SPACER, SAID ELECTROLYTE ADAPTED TO MELT AT A PREDETERMINED TEMPERATURE AND TO COOPERATE WITH THE ELECTORDES TO PRODUCE A CURRENT ADAPTED TO ACTUATE THE INDICATING MEANS.
References Cited (Backward Citations)
US856162A
Cited
US2586252A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-26 | 1961-02-25 | 1961-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-26 | 1965-02-25 | 1965-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-26 | 1969-02-25 | 1969-08-27 | $7700.00 | Window Closed / Lapsed |