US3227920A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-way lamp with thermal switch
Assignee: GTE Sylvania Inc
•
Filing: 1960-08-04
•
Granted: 1966-01-04
•
Expires: 1980-08-04
Abstract
No abstract record available.
Inventors
- 👤 Jr Sandford C Peek
- 👤 Daniel S Gustin
- 👤 David R Dayton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:01
CPC Classifications
H; H01; H01K; H01K1/00; H01K1/62; H01K1/64; H05; H05B; H05B39/00; H05B39/04; H05B39/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
IN A LIGHTNING SYSTEM, IN COMBINATION, A SOURCE OF VOLTAGE, A FIRST FILAMENT, A SECOND FILAMENT AND A MANUAL SWITCH NORMALLY CONNECTED IN SERIES, AND A NORMALLY CLOSED HEAT-RESPONSIVE SWITCH FORMING A SHUNT PATH AROUND SAID SECOND FILAMENT AND IN SERIES WITH SAID FIRST FILAMENT AND SAID SOURCE OF VOLTAGE, FIRST CLOSING OF SAID MANUAL SWITCH ENERGIZING SAID FIRST FILAMENT FROM SAID SOURCE OF VOLTAGE, HEAT FROM SAID FIRST FILAMENT CONDITIONING SAID HEAT-RESPON-
Claim 2
Dependent Claim
73 words
IN A LIGHTNING SYSTEM, IN COMBINATION, A SOURCE OF VOLTAGE, A FIRST FILAMENT, A SECOND FILAMENT AND A MANUAL SWITCH NORMALLY CONNECTED IN SERIES, AND A NORMALLY CLOSED HEAT-RESPONSIVE SWITCH FORMING A SHUNT PATH AROUND SAID SECOND FILAMENT AND IN SERIES WITH SAID FIRST FILAMENT AND SAID SOURCE OF VOLTAGE, FIRST CLOSING OF SAID MANUAL SWITCH ENERGIZING SAID FIRST FILAMENT FROM SAID SOURCE OF VOLTAGE, HEAT FROM SAID FIRST FILAMENT CONDITIONING SAID HEAT-RESPON-
References Cited (Backward Citations)
US603705A
Cited
US625219A
Cited
US635058A
Cited
US732644A
Cited
AT156333B
Cited
US2235360A
Cited
US2448493A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-03 | 1969-07-05 | 1970-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-03 | 1973-07-05 | 1974-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-03 | 1977-07-05 | 1978-01-04 | $7700.00 | Window Closed / Lapsed |