US2800446A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron emissive coating material and method of application
Assignee: RCA Corp
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Filing: 1953-07-27
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Granted: 1957-07-23
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Expires: 1973-07-27
Abstract
No abstract record available.
Inventors
- 👤 Mark N Fredenburgh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:11
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/02; H01J9/04; H01J9/042
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
148 words
A COATING SUSPENSION OF ELECTRON EMITTING MATERIAL ADAPTED FOR APPLICATION TO A BASE HAVING A NEGATIVE POLARITY, SAID SUSPENSION COMPRISING A POLYMERIC ESTER OF METHACRYLIC ACID, AN IONIZABLE SALT, PARTICLES OF SAID EMISSIVE MATERIAL, AND A POLAR SOLVENT FOR SAID POLYMERIC ESTER AND SAID SALT CONSISTING OF ACETONE, SAID POLYMERIC ESTER IN SOLUTION IN SAID SOLVENT CONTRIBUTING TO THE FORMATION OF POSITIVE CHARGES ON SAID PARTICLES FOR MIGRATION OF SAID PARTICLES TO SAID BASE DURING A COATING OPERATION, SAID POLYMERIC ESTER CONVERTING TO A MONOMERIC PHASE WITH A VAPOR PRESSURE APPROXIMATELY THAT OF WATER AT A FIRST PREDETERMINED TEMPERATURE USED IN THE MANUFACTURE OF ELECTRON TUBES AND A GASEOUS PHASE AT A SECOND PREDETERMINED TEMPERATURE USED IN SAID MANUFACTURE, WHEREBY SAID ESTER IS ADAPTED TO BE REMOVED DURING THE PROCESSING OF A TUBE HAVING AN ELEMENT THEROF COATED WITH SAID SUSPENSION AND TO PRESERVE SAID TUBE FROM CONTAMINATION.
Claim 2
Dependent Claim
148 words
A COATING SUSPENSION OF ELECTRON EMITTING MATERIAL ADAPTED FOR APPLICATION TO A BASE HAVING A NEGATIVE POLARITY, SAID SUSPENSION COMPRISING A POLYMERIC ESTER OF METHACRYLIC ACID, AN IONIZABLE SALT, PARTICLES OF SAID EMISSIVE MATERIAL, AND A POLAR SOLVENT FOR SAID POLYMERIC ESTER AND SAID SALT CONSISTING OF ACETONE, SAID POLYMERIC ESTER IN SOLUTION IN SAID SOLVENT CONTRIBUTING TO THE FORMATION OF POSITIVE CHARGES ON SAID PARTICLES FOR MIGRATION OF SAID PARTICLES TO SAID BASE DURING A COATING OPERATION, SAID POLYMERIC ESTER CONVERTING TO A MONOMERIC PHASE WITH A VAPOR PRESSURE APPROXIMATELY THAT OF WATER AT A FIRST PREDETERMINED TEMPERATURE USED IN THE MANUFACTURE OF ELECTRON TUBES AND A GASEOUS PHASE AT A SECOND PREDETERMINED TEMPERATURE USED IN SAID MANUFACTURE, WHEREBY SAID ESTER IS ADAPTED TO BE REMOVED DURING THE PROCESSING OF A TUBE HAVING AN ELEMENT THEROF COATED WITH SAID SUSPENSION AND TO PRESERVE SAID TUBE FROM CONTAMINATION.
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) | 1960-07-22 | 1961-01-21 | 1961-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-22 | 1965-01-21 | 1965-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-22 | 1969-01-21 | 1969-07-23 | $7700.00 | Window Closed / Lapsed |