US2716082A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorescent screens
Assignee: EIDP Inc
•
Filing: 1951-11-19
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Granted: 1955-08-23
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Expires: 1971-11-19
Abstract
No abstract record available.
Inventors
- 👤 James S Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:28
CPC Classifications
G; G21; G21K; G21K4/00; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
107 words
A FLUORESCENT SCREEN COMPRISING A SHEET SUPPORT BEARING ON ONE SURFACE IN ORDER A LAYER COMPRISING DISCRETE PARTICLES OF FLUORESCENT MATERIAL DISPERSED IN A HARDFILM-FORMING BINDING AGENT COMPRISING A MIXTURE OF CELLUOSE NITRATE AND AN ALKYL METHACRYLATE POLYMER SAID ALKYL GROUP CONTAINING 1 TO 4 CARBON ATOMS, THE CELLULOSE NITRATE BEING PRESENT IN THE PROPORTION OF 0.4 TO 8.0 PARTS PER PART BY WEIGHT OF SAID POLYMER AND AN ADHERENT PROTETIVE LAYER HAVING A THICKNESS OF 0.002 TO 0.05 MILLIMETER COMPOSED OF A HYDROPHOBIC CELLULOSE CARBOXYLIC ACID ESTER PREDOMINATING IN ACETATE GROUPS TAKEN FROM THE GROUP CONSISTING OF CELLULOSE ACETATE, CELLULOSE ACETATE PROPIONATE AND CELLULOSE ACETATE BUTYRATE.
Claim 2
Dependent Claim
107 words
A FLUORESCENT SCREEN COMPRISING A SHEET SUPPORT BEARING ON ONE SURFACE IN ORDER A LAYER COMPRISING DISCRETE PARTICLES OF FLUORESCENT MATERIAL DISPERSED IN A HARDFILM-FORMING BINDING AGENT COMPRISING A MIXTURE OF CELLUOSE NITRATE AND AN ALKYL METHACRYLATE POLYMER SAID ALKYL GROUP CONTAINING 1 TO 4 CARBON ATOMS, THE CELLULOSE NITRATE BEING PRESENT IN THE PROPORTION OF 0.4 TO 8.0 PARTS PER PART BY WEIGHT OF SAID POLYMER AND AN ADHERENT PROTETIVE LAYER HAVING A THICKNESS OF 0.002 TO 0.05 MILLIMETER COMPOSED OF A HYDROPHOBIC CELLULOSE CARBOXYLIC ACID ESTER PREDOMINATING IN ACETATE GROUPS TAKEN FROM THE GROUP CONSISTING OF CELLULOSE ACETATE, CELLULOSE ACETATE PROPIONATE AND CELLULOSE ACETATE BUTYRATE.
Claim 3
Dependent Claim
144 words
THE PROCESS WHICH COMPRISES COATING A THIN LAYER OF A CELLULOSE CARBOXYLIC ACID ESTER PREDOMINATING IN ACETATE GROUPS TAKEN FROM THE GROUPS CONSISTING OF CELLULOSE ACETATE, CELLULOSE ACETATE PROPIONATE AND CELLULOSE ACETATE BUTYRATE ONTO A SMOOTH CASTING SURFACE, COATING A DISPERSION COMPRISING (A) DISCRETE PARTICLES OF A FLUORESENT MATERIAL IN A MIXTURE COMPRISING CELLULOSE NITRATE AND AN ALKYL METHACRYLATE POLYMER SAID ALKYL GROUP CONTAINING 1 TO 4 CARBON ATOMS, THE CELLULOSE NITRATE BEING PRESENT IN THE PROPORTION OF 0.4 TO 8.0 PARTS PER PART BY WEIGHT OF SAID POLYMER, THE DISPERSION BEING IN A RATIO OF 1 PART BY WEIGHT OF THE BINDING AGENT TO 4 TO 50 PARTS OF THE FLUORESCENT MATERIAL AND (B) A HIGH-BOILING CELLULOSE ACETATE SOLVENT ONTO THE CELLULOSE ESTER LAYER, APPLYING A BACKING SHEET TO THE LAYER OF FLUORESCENT PARTICLES AND STRIPPING THE SCREEN ASSEMBLY FROM THE CASTING SURFACE.
Claim 4
Dependent Claim
144 words
THE PROCESS WHICH COMPRISES COATING A THIN LAYER OF A CELLULOSE CARBOXYLIC ACID ESTER PREDOMINATING IN ACETATE GROUPS TAKEN FROM THE GROUPS CONSISTING OF CELLULOSE ACETATE, CELLULOSE ACETATE PROPIONATE AND CELLULOSE ACETATE BUTYRATE ONTO A SMOOTH CASTING SURFACE, COATING A DISPERSION COMPRISING (A) DISCRETE PARTICLES OF A FLUORESENT MATERIAL IN A MIXTURE COMPRISING CELLULOSE NITRATE AND AN ALKYL METHACRYLATE POLYMER SAID ALKYL GROUP CONTAINING 1 TO 4 CARBON ATOMS, THE CELLULOSE NITRATE BEING PRESENT IN THE PROPORTION OF 0.4 TO 8.0 PARTS PER PART BY WEIGHT OF SAID POLYMER, THE DISPERSION BEING IN A RATIO OF 1 PART BY WEIGHT OF THE BINDING AGENT TO 4 TO 50 PARTS OF THE FLUORESCENT MATERIAL AND (B) A HIGH-BOILING CELLULOSE ACETATE SOLVENT ONTO THE CELLULOSE ESTER LAYER, APPLYING A BACKING SHEET TO THE LAYER OF FLUORESCENT PARTICLES AND STRIPPING THE SCREEN ASSEMBLY FROM THE CASTING SURFACE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-08-22 | 1959-02-21 | 1959-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-08-22 | 1963-02-21 | 1963-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-08-22 | 1967-02-21 | 1967-08-23 | $7700.00 | Window Closed / Lapsed |