US3254871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Time delay system
Assignee: Auto Tronic Control Co Inc
•
Filing: 1963-10-31
•
Granted: 1966-06-07
•
Expires: 1983-10-31
Abstract
No abstract record available.
Inventors
- 👤 Jose P Limon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:24
CPC Classifications
F; F23; F23N; F23N5/00; F23N5/24; F23N5/245; F23N2231/00; F23N2231/04; F23N2237/00; F23N2237/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
172 words
IN COMBINATION WITH A MAIN POWER SOURCE AND A FUEL SUPPLY VALVE FOR SUPPLYING FUEL TO A PLURALITY OF BURNERS OF AN INDUSTRIAL HEAT-TREATING FURNACE, SAID VALVE HAVING A VALVE STEM AND AN ELECTRICAL COIL TO PULL IN SAID STEM WHEN ENERGIZED AND TO OPEN SAID VALVE WHEN SAID COIL IS CONNECTED TO THE MAIN POWER SOURCE, MEANS CONNECTING SAID COIL IN CIRCUIT TO SAID POWER SOURCE, MEANS FOR CONTINUING TO ENERGIZE SAID COIL ONLY TEMPORARILY DURING A TEMPORARY POWER FAILURE OF SAID POWER SOURCE COMPRISING A SEPARATE, DIRECT CURRENT POWER SOURCE IN ADDITION TO SAID MAIN POWER SOURCE, CIRCUIT MEANS CONNECTING SAID DIRECT CURRENT POWER SOURCE WITH SAID COIL, A PAIR OF CONTACTS IN SAID CIRCUIT MEANS FOR CONNECTING AND DISCONNECTING SAID DIRECT CURRENT POWER SOURCE AND SAID COIL, AND MEANS TO OPEN SAID CONTACTS WHILE SID MAIN POWER SOURCE HOLDS IN SAID COIL AND TO CLOSE SAID CONTACTS UPON FAILURE OF SAID MAIN POWER SOURCE TO CONNECT SAID DIRECT CURRENT POWER SOURCE AND SAID COIL TO TEMPORARILY ENERGIZE SAID COIL.
Claim 2
Dependent Claim
172 words
IN COMBINATION WITH A MAIN POWER SOURCE AND A FUEL SUPPLY VALVE FOR SUPPLYING FUEL TO A PLURALITY OF BURNERS OF AN INDUSTRIAL HEAT-TREATING FURNACE, SAID VALVE HAVING A VALVE STEM AND AN ELECTRICAL COIL TO PULL IN SAID STEM WHEN ENERGIZED AND TO OPEN SAID VALVE WHEN SAID COIL IS CONNECTED TO THE MAIN POWER SOURCE, MEANS CONNECTING SAID COIL IN CIRCUIT TO SAID POWER SOURCE, MEANS FOR CONTINUING TO ENERGIZE SAID COIL ONLY TEMPORARILY DURING A TEMPORARY POWER FAILURE OF SAID POWER SOURCE COMPRISING A SEPARATE, DIRECT CURRENT POWER SOURCE IN ADDITION TO SAID MAIN POWER SOURCE, CIRCUIT MEANS CONNECTING SAID DIRECT CURRENT POWER SOURCE WITH SAID COIL, A PAIR OF CONTACTS IN SAID CIRCUIT MEANS FOR CONNECTING AND DISCONNECTING SAID DIRECT CURRENT POWER SOURCE AND SAID COIL, AND MEANS TO OPEN SAID CONTACTS WHILE SID MAIN POWER SOURCE HOLDS IN SAID COIL AND TO CLOSE SAID CONTACTS UPON FAILURE OF SAID MAIN POWER SOURCE TO CONNECT SAID DIRECT CURRENT POWER SOURCE AND SAID COIL TO TEMPORARILY ENERGIZE SAID COIL.
References Cited (Backward Citations)
US2982351A
Cited
US2958811A
Cited
US3076495A
Cited
US3116753A
Cited
US3153440A
Cited
US3143161A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-06-06 | 1969-12-06 | 1970-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-06 | 1973-12-06 | 1974-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-06 | 1977-12-06 | 1978-06-07 | $7700.00 | Window Closed / Lapsed |