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US3221226A
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Wrinkle free polyester film dielectric for capacitors
Assignee: Eastman Kodak Co
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Filing: 1960-12-20
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Granted: 1965-11-30
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Expires: 1980-12-20
Abstract
No abstract record available.
Inventors
- 👤 William D Kennedy
- 👤 James J Jefferson
- 👤 Marshall T Watson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:42
CPC Classifications
H; H01; H01G; H01G4/00; C; C08; C08K; C08K3/00; C08K3/01; C08K3/013; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/42; H01B3/421; H01B3/422; H01B3/423
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
150 words
AN ELECTRICAL CAPACITOR COMPRISING A SMOOTH ROLL OF POLYESTER FILM WHICH HAS A THICKNESS OF LESS THAN ABOUT 0.001 INCH, SAID POLYESTER COMPRISING A LINEAR HIGHLY POLYMERIC CONDENSATION POLYESTER OF AT LEAST ONE AROMATIC DICARBOXYLIC ACID AND A GLYCOL CONTAINING DISPERSED THEREIN FROM ABOUT 0.01 TO ABOUT 0.50 PERCENT BY WEIGHT OF SAID POLYESTER OF A FINELY DIVIDED INORGANIC PIGMENT HAVING A REFRACTIVE INDEX OF FROM ABOUT 1.40 TO ABOUT 2.55, THE PARTICLES OF SAID PIGMENT HAVING AN AVERAGE DIAMETER OF FROM ABOUT 0.01 TO ABOUT 10 MICRONS WHEREBY SAID FILM HAS AN APPEARANCE SUBSTANTIALLY UNALTERED BY THE PRESENCE OF SAID PIGMENT WHICH IS SELECTED FROM THE GROUP CONSISTING OF SILICA, TITANIA, ZIRCONIA, ALUMINA AND BENTONITE, SAID ROLL CONSISTING OF A PLURALITY OF ALTERNATING LAYERS OF SAID POLYESTER FILM AND AN ELECTRICALLY CONDUCTIVE FILM SUPERIMPOSED IN A SUCCESSIVE RELATIONSHIP SUCH THAT WRINKLING IS AVOIDED BY THE PRESENCE OF SAID PIGMENT.
Claim 2
Dependent Claim
150 words
AN ELECTRICAL CAPACITOR COMPRISING A SMOOTH ROLL OF POLYESTER FILM WHICH HAS A THICKNESS OF LESS THAN ABOUT 0.001 INCH, SAID POLYESTER COMPRISING A LINEAR HIGHLY POLYMERIC CONDENSATION POLYESTER OF AT LEAST ONE AROMATIC DICARBOXYLIC ACID AND A GLYCOL CONTAINING DISPERSED THEREIN FROM ABOUT 0.01 TO ABOUT 0.50 PERCENT BY WEIGHT OF SAID POLYESTER OF A FINELY DIVIDED INORGANIC PIGMENT HAVING A REFRACTIVE INDEX OF FROM ABOUT 1.40 TO ABOUT 2.55, THE PARTICLES OF SAID PIGMENT HAVING AN AVERAGE DIAMETER OF FROM ABOUT 0.01 TO ABOUT 10 MICRONS WHEREBY SAID FILM HAS AN APPEARANCE SUBSTANTIALLY UNALTERED BY THE PRESENCE OF SAID PIGMENT WHICH IS SELECTED FROM THE GROUP CONSISTING OF SILICA, TITANIA, ZIRCONIA, ALUMINA AND BENTONITE, SAID ROLL CONSISTING OF A PLURALITY OF ALTERNATING LAYERS OF SAID POLYESTER FILM AND AN ELECTRICALLY CONDUCTIVE FILM SUPERIMPOSED IN A SUCCESSIVE RELATIONSHIP SUCH THAT WRINKLING IS AVOIDED BY THE PRESENCE OF SAID PIGMENT.
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) | 1968-11-29 | 1969-05-31 | 1969-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-29 | 1973-05-31 | 1973-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-29 | 1977-05-31 | 1977-11-30 | $7700.00 | Window Closed / Lapsed |