US4073558A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode ray tube fabricating process
Assignee: GTE Sylvania Inc
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Filing: 1977-04-25
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Granted: 1978-02-14
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Expires: 1997-04-25
Abstract
Abstract A process for fabricating cathode ray tubes having an envelope which contains an electron gun assembly and unwanted water vapor includes the steps of loading the cathode ray tube onto an exhaust machine, heating the cathode ray tube to an internal temperature greater than the condensation temperature of the water vapor during evacuation, and evacuating the water vapor from the envelope.
Inventors
- 👤 David Benda
- 👤 Franklin G. Reigel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:24
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/38; H01J9/385
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
108 words
A process for fabricating a cathode ray tube having an envelope with a funnel portion including a viewing screen and a neck portion including an electron gun assembly and said envelope having unwanted gases therein including water vapor, said process comprising the steps of: loading said cathode ray tube onto a cathode ray tube exhaust machine which includes evacuating and heating apparatus; activating said heating apparatus to provide a temperature internal of said envelope in the range of about 40°-70° C; and subsequently activating said evacuating apparatus to effect removal of said unwanted gases and water vapor from said envelope while said envelope is heated in said range.
Claim 2
Dependent Claim
108 words
A process for fabricating a cathode ray tube having an envelope with a funnel portion including a viewing screen and a neck portion including an electron gun assembly and said envelope having unwanted gases therein including water vapor, said process comprising the steps of: loading said cathode ray tube onto a cathode ray tube exhaust machine which includes evacuating and heating apparatus; activating said heating apparatus to provide a temperature internal of said envelope in the range of about 40°-70° C; and subsequently activating said evacuating apparatus to effect removal of said unwanted gases and water vapor from said envelope while said envelope is heated in said range.
Claim 3
Dependent Claim
26 words
The process of claim 1 wherein said electron gun assembly is of the in-line type having a plurality of electron guns aligned in a single plane.
Claim 4
Dependent Claim
67 words
The process of claim 1 wherein said electron gun assembly reaches temperatures in the range of about 300°-450° C during sealing thereof into said neck portion of said envelope and said electron gun assembly includes cathode electrodes having an emissive coating thereon with a binder material at least partially decomposed by said temperatures prior to said step of loading said cathode ray tube onto said exhaust machine.
Claim 5
Dependent Claim
95 words
In a process for fabricating a cathode ray tube having an envelope with funnel and neck portions and containing a viewing screen, electron gun assembly, and unwanted gases including water vapor, the steps of: loading said cathode ray tube onto an exhaust machine which includes heating and evacuating apparatus; heating said cathode ray tube to an internal temperature in the range of about 40°-70° C; and subsequently evacuating and heating said cathode ray tube to effect removal of said unwanted gases and said water vapor while said cathode ray tube is heated in said range.
Claim 6
Dependent Claim
95 words
In a process for fabricating a cathode ray tube having an envelope with funnel and neck portions and containing a viewing screen, electron gun assembly, and unwanted gases including water vapor, the steps of: loading said cathode ray tube onto an exhaust machine which includes heating and evacuating apparatus; heating said cathode ray tube to an internal temperature in the range of about 40°-70° C; and subsequently evacuating and heating said cathode ray tube to effect removal of said unwanted gases and said water vapor while said cathode ray tube is heated in said range.
Claim 7
Dependent Claim
75 words
In the cathode ray tube fabricating process of claim 1, the step of heating said cathode ray tube to a temperature in the range of about 300°-450° C during sealing of said electron gun assembly into said neck portion of said envelope and effecting at least partial decomposition of binder material in a cathode coating included in said electron gun assembly prior to said step of loading said cathode ray tube onto said exhaust machine.
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) | 1981-02-13 | 1981-08-15 | 1982-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-13 | 1985-08-15 | 1986-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-13 | 1989-08-15 | 1990-02-14 | $7700.00 | Window Closed / Lapsed |