US3238519A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combustible gas detector circuit
Assignee: Individual
•
Filing: 1963-03-13
•
Granted: 1966-03-01
•
Expires: 1983-03-13
Abstract
No abstract record available.
Inventors
- 👤 James E Ramsey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:50
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/14; G01N27/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
A GAS DETECTOR FOR INDICATING THE PRESENCE OF A COMBUSTIBLE GAS COMPRISING A SOURCE OF CURRENT, A TRANSFORMER IN CONNECTION WITH SAID CURRENT SOURCE, A PLATINUM FILAMENT, AN ALARM CIRCUIT AND ALARM DEVICE AND A RELAY CONNECTED TO SAID CURRENT SOURCE OF CONTROLLING SAID ALARM CIRCUIT, A TRANSISTOR, A SILICON SOLAR CELL ELECTRICALLY CONNECTED WITH THE BASE ELECTRODE OF SAID TRANSISTOR, SAID FILAMENT BEING ELECTRICALLY CONNECTED WITH THE EMITTER ELECTRODE OF SAID TRANSISTOR AND THE SECONDARY OF SAID TRANSFORMER, SAID SILICON SOLAR CELL BEING ELECTRICALLY CONNECTED WITH SAID SECONDARY OF SAID TRANSFORMER, SAID RELAY ELECTRICALLY CONNECTED WITH SAID EMITTER ELECTRODE OF SAID TRANSISTOR AND SAID COLLECTOR ELECTRODE OF SAID TRANSISTOR CONNECTED WITH THE PRIMARY OF SAID TRANSFORMER, SAID LAST NAMED CONNECTION INCLUDING A RECTIFIER, SAID CELL RESPONSIVE IN OPERATION TO INCREASED RADIATION OF SAID FILAMENT SO AS TO GENERATE VOLTAGE NULLIFYING SAID BASE VOLTAGE.
Claim 2
Dependent Claim
144 words
A GAS DETECTOR FOR INDICATING THE PRESENCE OF A COMBUSTIBLE GAS COMPRISING A SOURCE OF CURRENT, A TRANSFORMER IN CONNECTION WITH SAID CURRENT SOURCE, A PLATINUM FILAMENT, AN ALARM CIRCUIT AND ALARM DEVICE AND A RELAY CONNECTED TO SAID CURRENT SOURCE OF CONTROLLING SAID ALARM CIRCUIT, A TRANSISTOR, A SILICON SOLAR CELL ELECTRICALLY CONNECTED WITH THE BASE ELECTRODE OF SAID TRANSISTOR, SAID FILAMENT BEING ELECTRICALLY CONNECTED WITH THE EMITTER ELECTRODE OF SAID TRANSISTOR AND THE SECONDARY OF SAID TRANSFORMER, SAID SILICON SOLAR CELL BEING ELECTRICALLY CONNECTED WITH SAID SECONDARY OF SAID TRANSFORMER, SAID RELAY ELECTRICALLY CONNECTED WITH SAID EMITTER ELECTRODE OF SAID TRANSISTOR AND SAID COLLECTOR ELECTRODE OF SAID TRANSISTOR CONNECTED WITH THE PRIMARY OF SAID TRANSFORMER, SAID LAST NAMED CONNECTION INCLUDING A RECTIFIER, SAID CELL RESPONSIVE IN OPERATION TO INCREASED RADIATION OF SAID FILAMENT SO AS TO GENERATE VOLTAGE NULLIFYING SAID BASE VOLTAGE.
References Cited (Backward Citations)
US2835886A
Cited
US3041590A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-02-28 | 1969-08-30 | 1970-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-28 | 1973-08-30 | 1974-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-28 | 1977-08-30 | 1978-03-01 | $7700.00 | Window Closed / Lapsed |