US3781076A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode ray tube reclamation process
Assignee: Zenith Electronics LLC
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Filing: 1971-12-06
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Granted: 1973-12-25
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Expires: 1991-12-06
Abstract
Abstract A method of neutralizing an undesired constituent trapped within a cathode ray tube which includes a gas absorber contemplates irradiating the constituent with a source of electromagnetic energy for a period of time sufficient to reduce the constituent to its gaseous reaction products and then effecting absorption of the gaseous products by pumping action of the gas absorber.
Inventors
- 👤 L Dietch
- 👤 M Lerner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:15
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/50; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/82
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
174 words
A method of neutralizing an undesired constituent trapped within an evacuated cathode ray tube which includes a cathode, an accelerating electrode and an activated gas absorbing getter device, said constituent having a thermal decomposition temperature higher than any processing temperature employed in the manufacture of said cathode ray tube but which is reducible by electron impingement during normal operation of said tube into reaction products including a contaminant that tends to reduce the emission of said cathode, said method comprising the following steps: energzing said cathode to an operating temperature higher than its normal operating temperature to produce emission of electrons; energizing said accelerating electrode for operation at an elevated potential to generate a beam of high energy electrons; directing said beam of electrons upon that region within said cathode ray tube suspected of containing said undesired constituent to bombard said constituent for a period of time sufficient to reduce said constituent to its gaseous reaction products including said contaminant; and effecting absorption of said contaminant by the pumping action of said activated getter.
Claim 2
Independent Claim
174 words
A method of neutralizing an undesired constituent trapped within an evacuated cathode ray tube which includes a cathode, an accelerating electrode and an activated gas absorbing getter device, said constituent having a thermal decomposition temperature higher than any processing temperature employed in the manufacture of said cathode ray tube but which is reducible by electron impingement during normal operation of said tube into reaction products including a contaminant that tends to reduce the emission of said cathode, said method comprising the following steps: energzing said cathode to an operating temperature higher than its normal operating temperature to produce emission of electrons; energizing said accelerating electrode for operation at an elevated potential to generate a beam of high energy electrons; directing said beam of electrons upon that region within said cathode ray tube suspected of containing said undesired constituent to bombard said constituent for a period of time sufficient to reduce said constituent to its gaseous reaction products including said contaminant; and effecting absorption of said contaminant by the pumping action of said activated getter.
Claim 3
Dependent Claim
81 words
The method as set forth in claim 1 for use with a cathode ray tube having a controllable deflection apparatus associated therewith for generating within said tube a scansion of the desired configuration; wherein said method includes the step of energizing said deflection apparatus to develop a scansion raster with said generated beam of electrons; and the further step of adjusting said deflection apparatus to concentrate said scansion raster upon that region of said tube suspected of containing said undesired constituent.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |