Patent US3222567A successfully refreshed from Google Patents.
US3222567A
Expired / Lapsed
US
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Projection lamp
Assignee: GTE Sylvania Inc
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Filing: 1962-03-09
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Granted: 1965-12-07
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Expires: 1982-03-09
Abstract
No abstract record available.
Inventors
- 👤 Richard E Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:14
CPC Classifications
H; H01; H01K; H01K7/00; H01K7/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
AN ELECTRIC INCANDESCENT LAMP HAVING AN ACTIVE FILAMENT COIL OPERATING AT HIGH TEMPERATURE TO ACT AS A SOURCE OF LIGHT FOR AN OPTICAL SYSTEM AND A BALLAST FILAMENT COIL OPERATING AT LOWER TEMPERATURE IN SERIES WITH SAID FIRSTMENTIONED FILAMENT COIL AND HAVING SUFFICIENT RESISTANCE TO ACT AS A BALLAST TO INHIBIT TENDENCY TO ARC-OUT ACROSS THE ACTIVE COIL, SAID BALLAST COIL HAVING A FILAMENT OF SMALLER DIAMETER THAN THE FILAMENT OF THE ACTIVE COIL AND OF SUCH RESISTANCE COMPARED TO THE RESISTANCE OF THE ACTIVE COIL THAT IT WILL COME TO ITS FULL TEMPERATURE QUICKER THAN SAID ACTIVE COIL, AND BEING OF A MORE OPEN PITCH TO OPERATE AT A LOWER TEMPERATURE THAN THE ACTIVE COIL.
Claim 2
Dependent Claim
116 words
AN ELECTRIC INCANDESCENT LAMP HAVING AN ACTIVE FILAMENT COIL OPERATING AT HIGH TEMPERATURE TO ACT AS A SOURCE OF LIGHT FOR AN OPTICAL SYSTEM AND A BALLAST FILAMENT COIL OPERATING AT LOWER TEMPERATURE IN SERIES WITH SAID FIRSTMENTIONED FILAMENT COIL AND HAVING SUFFICIENT RESISTANCE TO ACT AS A BALLAST TO INHIBIT TENDENCY TO ARC-OUT ACROSS THE ACTIVE COIL, SAID BALLAST COIL HAVING A FILAMENT OF SMALLER DIAMETER THAN THE FILAMENT OF THE ACTIVE COIL AND OF SUCH RESISTANCE COMPARED TO THE RESISTANCE OF THE ACTIVE COIL THAT IT WILL COME TO ITS FULL TEMPERATURE QUICKER THAN SAID ACTIVE COIL, AND BEING OF A MORE OPEN PITCH TO OPERATE AT A LOWER TEMPERATURE THAN THE ACTIVE COIL.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-12-06 | 1969-06-07 | 1969-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-06 | 1973-06-07 | 1973-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-06 | 1977-06-07 | 1977-12-07 | $7700.00 | Window Closed / Lapsed |