Patent US3229770A successfully refreshed from Google Patents.
US3229770A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic actuator for fire protection systems
Assignee: Individual
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Filing: 1964-06-03
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Granted: 1966-01-18
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Expires: 1984-06-03
Abstract
No abstract record available.
Inventors
- 👤 Harvey James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:43
CPC Classifications
A; A62; A62C; A62C35/00; A62C35/58; A62C35/60; A62C35/605
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
107 words
IN A HEAT-ACTUATED FIRE PROTECTION SYSTEM, THE COMBINATION WITH A LOW-PRESSURE AIR-OPERATED RELEASE DEVICE FOR CONTROLLING THE APPLICATION OF AN EXTINGUISHING AGENT IN A FIRE ZONE AND HEAT-RESPONSIVE MEANS CONNECTED THROUGH A LOW-PRESSURE CONDUIT SYSTEM FOR APPLYING INCREASED AIR PRESSURE TO OPERATE SAID DEVICE, OF MEANS PROVIDING AN AIR CHAMBER IN COMMUNICATION WITH SAID CONDUIT SYSTEM, MEANS RESPONSIVE TO ELECTRIC OPERATING CURRENT FOR INCREASING THE AIR PRESSURE IN SAID CHAMBER AND SAID CONDUIT SYSTEM EFFECTIVE TO ACTUATE SAID RELEASE DEVICE, AND TRANSISTOR SWITCH MEANS RESPONSIVE TO RELATIVELY HIGH-INTENSITY LIGHT FROM SAID FIRE ZONE CONNECTED IN A CIRCUIT WITH SAID CURRENTRESPONSIVE MEANS FOR APPLYING SAID OPERATING CURRENT THERETO.
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) | 1969-01-17 | 1969-07-19 | 1970-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-17 | 1973-07-19 | 1974-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-17 | 1977-07-19 | 1978-01-18 | $7700.00 | Window Closed / Lapsed |