US3255373A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Halophosphate phosphor material of improved luminosity and maintenance characteristics for fluorescent lamps
Assignee: Philips North America LLC
•
Filing: 1957-09-18
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Granted: 1966-06-07
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Expires: 1977-09-18
Abstract
No abstract record available.
Inventors
- 👤 Jacob Van Broekhoven
- 👤 Robert W Repsher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:58
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/38; H01J61/42; H01J61/44; C; C09; C09K; C09K11/00; C09K11/08; C09K11/74; C09K11/75; C09K11/76
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
45 words
A HALOPHOSPHATE PHOSPHOR MATERIAL FOR USE IN FLUORESCENT LAMPS, SAID PHOSPHOR MATERIAL BEING IN THE FORM OF A PLURALITY OF FINELY-DIVIDED PARTICLES, AND SUBSTANTIALLY ALL OF SAID PARTICLES HAVING AN AVERAGE DIAMETER FALLING WITHIN THE RANGE OF FROM ABOUT 4 MICRONS TO ABOUT 11 MICRONS.
Claim 2
Independent Claim
119 words
THE METHOD OF IMPROVING THE 2537 A.U. LUMINOSITY RESPONSE AND MAINTENANCE PERFORMANCE OF FINELY-DIVIDED PARTICLES OF HALOPHOSPHATE PHOSPHOR MATERIAL FOR USE IN FLUORESCENT LAMPS, COMPRISING SUSPENDING SAID FINELYDIVIDED PHOSPHOR MATERIAL IN A LIQUID VEHICLE WHICH INCLUDES A PHOSPHOR-PARTICLE DISPERSING MEDIUM, ALLOWING SUBSTANTIALLY ONLY THE PHOSPHOR PARTICLES HAVING AN AVERAGE PARTICLE DIAMETER GREATER THAN ABOUT 11 MICRONS TO SETTLE IN SAID LIQUID VEHICLE, SEPARATING SAID SETTLED PHOSPHOR PARTICLES FROM SAID LIQUID VEHICLE AND THE UNSETTLED PHOSPHOR PARTICLES REMAINING THEREIN, ALLOWING SUBSTANTIALLY ALL THE REMAINING PHOSPHOR PARTICLES HAVING AN AVERAGE PARTICLE DIAMETER OF ABOUT 4 MICRONS AND GREATER TO SETTLE IN SAID LIQUID VEHICLE, AND SEPARATING THESE LATTER-SETTLED PHOSPHOR PARTICLES FROM SAID LIQUID VEHICLE AND FROM UNSETTLED PHOSPHOR PARTICLES REMAINING THEREIN.
References Cited (Backward Citations)
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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) | 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 |