US3875455A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Undercoat for phosphor in reprographic lamps having titanium dioxide reflectors
Assignee: General Electric Co
•
Filing: 1973-04-18
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Granted: 1975-04-01
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Expires: 1993-04-18
Abstract
Abstract An undercoat of magnesium oxide (MgO) is provided between the phosphor and a titanium dioxide (TiO2) reflector in an aperturetype fluorescent reprographic lamp. Preferably, aluminum oxide (Al2O3), or aluminum oxide and antimony oxide (Sb2O3), are included with the MgO in the undercoat.
Inventors
- 👤 Edward E Kaduk
- 👤 Ronald J Olwert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:29
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/38; H01J61/42; H01J61/44; H01J61/46
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
62 words
A APERTURE-TYPE FLUORESCENT REPROGRAPHIC LAMP COMPRISING AN ELONGATED ENVELOPE CONTAINING AN IONIZABLE MEDIUM INCLUDING MERCURY VAPOR AND HAVING ELECTRODES AT THE RESPECTIVE ENDS THEREOF, A TIO2 REFLECTOR COATING WITHIN SAID ENVELOPE AND A PHOSPHOR COATING WITHIN SAID REFLECTOR COATING, WHEREIN THE IMPROVEMENT COMPRISES AN UNDERCOAT OF MGO COMBINED WITH AL2O3 BETWEEN AND IN CONTACT WITH SAID PHOSPHOR COATING AND SAID REFLECTOR COATING.
Claim 2
Dependent Claim
62 words
A APERTURE-TYPE FLUORESCENT REPROGRAPHIC LAMP COMPRISING AN ELONGATED ENVELOPE CONTAINING AN IONIZABLE MEDIUM INCLUDING MERCURY VAPOR AND HAVING ELECTRODES AT THE RESPECTIVE ENDS THEREOF, A TIO2 REFLECTOR COATING WITHIN SAID ENVELOPE AND A PHOSPHOR COATING WITHIN SAID REFLECTOR COATING, WHEREIN THE IMPROVEMENT COMPRISES AN UNDERCOAT OF MGO COMBINED WITH AL2O3 BETWEEN AND IN CONTACT WITH SAID PHOSPHOR COATING AND SAID REFLECTOR COATING.
Claim 3
Dependent Claim
14 words
A lamp as claimed in claim 1 in which said undercoat further includes Sb2O3.
Claim 4
Dependent Claim
23 words
A lamp as claimed in claim 2 in which said undercoat comprises about 99.1 percent MgO, 0.5 percent Al2O3, and 0.4 percent Sb2O3.
Claim 5
Dependent Claim
27 words
A lamp as claimed in claim 2 in which said reflector coating and said undercoat materials are in the form of small particles about the same size.
Claim 6
Dependent Claim
18 words
A lamp as claimed in claim 4 in which said particles are less than one micron in diameter.
Claim 7
Dependent Claim
17 words
A lamp as claimed in claim 5 in which said particles average about 0.3 micron in diameter.
References Cited (Backward Citations)
US2854600A
Cited
US3225241A
Cited
US3275872A
Cited
US3541376A
Cited
US3717781A
Cited
US3599029A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |