§
Luxuse
Patent Intelligence
Sign In
← Back to Patent Explorer
US4337410A Expired / Lapsed US ⏱️ 0.0 years remaining

Cathode-ray tube face-plate

Assignee: US Philips Corp
•
Filing: 1980-09-02
•
Granted: 1982-06-29
•
Expires: 2000-09-02
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract Glass compositions which are suitable for making face-plates of cathode-ray tubes used for displaying television pictures, particularly for displaying color television pictures. A problem in formulating such glasses is to obtain glasses which can be worked satisfactorily and which do not discolor significantly as a result of electron bombardment and X-ray irradiation. The glass compositions consist of the following constituents in the following quantities (expressed in % by weight): ______________________________________ SiO 2 57-65 ZrO 2 1-4 Al 2 O 3 0-4 SrO 6-14 Na 2 O 5.5-8.0 PbO 0-1 K 2 O 7.5-10.0 Sb 2 O 3 + As 2 O 3 0-2 MgO 0-4 TiO 2 0.2-2.0 CaO 0-4 CeO 2 0.05-1.0 ______________________________________ wherein wt. % Na 2 O/(wt. % Na 2 O+wt. % K 2 O)=0.40-0.47 and wt. % BaO+2 wt. % SrO+2 wt. % ZrO 2 +3 wt. % PbO>32.

Inventors

  • 👤 Josephus J. Van der Geer
  • 👤 Willem Van Pelt
  • 👤 Marinus Ploeger
  • 👤 Wilhelmus J. Spoor
  • 👤 Gerardus H. A. M. van der Steen

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-26 10:13
CPC Classifications
C; C03; C03C; C03C4/00; C03C4/08; C03C4/087; C03C3/00; C03C3/04; C03C3/076; C03C3/078; C03C3/083; C03C3/085; H; H01; H01J; H01J29/00; H01J29/86; H01J29/863

Claims Analysis

Total Claims: 9
Claim 1
Independent Claim 64 words
A fluorine-free glass consisting essentially of the following constituents in the following quantities (expressed in percent by weight): ______________________________________ SiO.sub.2 59-62 ZrO.sub.2 1.5-2.5 Al.sub.2 O.sub.3 0.2-2.0 SrO 9-12 Na.sub.2 O 5.5-8.0 PbO 0 K.sub.2 O 7.5-10.0 Sb.sub.2 O.sub.3 0-1.0 As.sub.2 O.sub.3 O MgO 0-2.0 TiO.sub.2 0.1-1.0 CaO 0-2.0 CeO.sub.2 0.05-0.5 BaO 8-10.0 ______________________________________ wherein wt.% Na 2 O/(wt.% Na 2 O+wt.% K 2 O)=0.42-0.45.
Claim 2
Dependent Claim 64 words
A fluorine-free glass consisting essentially of the following constituents in the following quantities (expressed in percent by weight): ______________________________________ SiO.sub.2 59-62 ZrO.sub.2 1.5-2.5 Al.sub.2 O.sub.3 0.2-2.0 SrO 9-12 Na.sub.2 O 5.5-8.0 PbO 0 K.sub.2 O 7.5-10.0 Sb.sub.2 O.sub.3 0-1.0 As.sub.2 O.sub.3 O MgO 0-2.0 TiO.sub.2 0.1-1.0 CaO 0-2.0 CeO.sub.2 0.05-0.5 BaO 8-10.0 ______________________________________ wherein wt.% Na 2 O/(wt.% Na 2 O+wt.% K 2 O)=0.42-0.45.
Claim 3
Dependent Claim 11 words
A cathode-ray tube face-plate comprising a glass as in claim 1.
Claim 4
Dependent Claim 17 words
A cathode-ray tube for displaying colour television pictures having a cathode-ray tube face-plate as in claim 2.
Claim 5
Dependent Claim 54 words
A glass as in claim 1, comprising the following constituents in the following quantities (expressed in percent by weight): ______________________________________ SiO.sub.2 60.64 ZrO.sub.2 2.1 Al.sub.2 O.sub.3 0.66 SrO 10.4 Na.sub.2 O 6.6 PbO 0 K.sub.2 O 8.6 Sb.sub.2 O.sub.3 0.55 MgO 0.3 As.sub.2 O.sub.3 0 CaO 0.4 TiO.sub.2 0.45 BaO 9.0 CeO.sub.2 0.2 ______________________________________
Claim 6
Dependent Claim 53 words
A fluorine-free glass consisting essentially of the following constituents in the following quantities (expressed in percent by weight): ______________________________________ SiO.sub.2 60.34 ZrO.sub.2 2.1 Al.sub.2 O.sub.3 0.66 SrO 10.4 Na.sub.2 O 6.6 PbO 0.3 K.sub.2 O 8.6 Sb.sub.2 O.sub.3 0.55 MgO 0.3 As.sub.2 O.sub.3 0 CaO 0.4 TiO.sub.2 0.45 BaO 9.0 CeO.sub.2 0.2 ______________________________________
Claim 7
Dependent Claim 53 words
A fluorine-free glass consisting essentially of the following constituents in the following quantities (expressed in percent by weight): ______________________________________ SiO.sub.2 60.34 ZrO.sub.2 2.1 Al.sub.2 O.sub.3 0.66 SrO 10.4 Na.sub.2 O 6.6 PbO 0.3 K.sub.2 O 8.6 Sb.sub.2 O.sub.3 0.55 MgO 0.3 As.sub.2 O.sub.3 0 CaO 0.4 TiO.sub.2 0.45 BaO 9.0 CeO.sub.2 0.2 ______________________________________
Claim 8
Dependent Claim 53 words
A fluorine-free glass consisting essentially of the following constituents in the following quantities (expressed in percent by weight): ______________________________________ SiO.sub.2 59.8 ZrO.sub.2 2.2 Al.sub.2 O.sub.3 0.66 SrO 10.7 Na.sub.2 O 6.8 PbO 0.3 K.sub.2 O 7.8 Sb.sub.2 O.sub.3 0.55 MgO 0.3 As.sub.2 O.sub.3 0 CaO 0.4 TiO.sub.2 0.45 BaO 9.3 CeO.sub.2 0.2 ______________________________________
Claim 9
Dependent Claim 53 words
A fluorine-free glass consisting essentially of the following constituents in the following quantities (expressed in percent by weight): ______________________________________ SiO.sub.2 59.8 ZrO.sub.2 2.2 Al.sub.2 O.sub.3 0.66 SrO 10.7 Na.sub.2 O 6.8 PbO 0.3 K.sub.2 O 7.8 Sb.sub.2 O.sub.3 0.55 MgO 0.3 As.sub.2 O.sub.3 0 CaO 0.4 TiO.sub.2 0.45 BaO 9.3 CeO.sub.2 0.2 ______________________________________

References Cited (Backward Citations)

US3725710A Cited
US4065317A Cited
US3925089A Cited
JPS5171314A Cited
US3987330A Cited
US4015966A Cited
US4277286A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1985-06-28 1985-12-28 1986-06-29 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1989-06-28 1989-12-28 1990-06-29 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1993-06-28 1993-12-28 1994-06-29 $7700.00 Window Closed / Lapsed

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag