Patent US3663246A successfully refreshed from Google Patents.
US3663246A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass for television display cathode-ray tubes
Assignee: US Philips Corp
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Filing: 1969-10-22
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Granted: 1972-05-16
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Expires: 1989-10-22
Abstract
Abstract Glass for envelopes of television display cathode-ray tubes, particularly screen glass for color television, which transmits at most 0.5 mr/h of X-ray radiation at an acceleration voltage of 40 to 45 k. volt, and which has a composition in percent by weight: SiO2 58-67 PbO 2-7 Li2O 0-1 MgO 0-3 Na2O 2-3 Al2O3 14 K2O 11-14 As2O3 + OR - 0.3-0.7 Sb2O3CaO 3-4.5 CeO2 0.05-0.6 BaO 11-14
Inventors
- 👤 Coenraad Maria La Grouw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:50
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/095; C03C3/102; C03C3/105
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
35 words
Glass as claimed in claim 1, consisting essentially of the following in percent by weight: SiO2 59 BaO 12.3 Li2O 0.4 PbO 6.3 Na2O 2.4 Al2O3 2.2 K2O 12.7 Sb2O3 0.3 CaO 3.6 CeO2 0.5
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |