US2501868A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dielectric material
Assignee: AT&T Inc
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Filing: 1949-02-10
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Granted: 1950-03-28
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Expires: 1969-02-10
Abstract
No abstract record available.
Inventors
- 👤 Frank B Hodgdon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:51
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/44; H01B3/442; C; C08; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
A METHOD OF MAKING A DIELECTRIC MATERIAL COMPRISING INCORPORATING POLYSTYRENE WITH A COMMINUTED INORGANIC DIELECTRIC MATERIAL BY MIXING THEM UNDER SUCH HEAT AND PRESSURE AS TO LIQUEFY THE POLYSTYRENE AND CAUSE THE POLYSTYRENE TO COAT THE DIELECTRIC MATERIAL, WHILE THE POLYSTYRENE IS STILL LIQUID, ADDING TO THE MIXTURE A LIQUID WHICH WILL WET THE POLYSTYRENE BUT WHICH IS A NON-SOLVENT FOR POLYSTYRENE TO OBTAIN A DIELECTRIC COATING COMPOSITION OF THE REQUIRED VISCOSITY, APPLYING THIS COMPOSITION TO A FILM OF POLYSTYRENE, DRYING AND CALENDERING THE COATED FILM, AND HEATING THE FILM TO RELIEVE THE STRAINS IN THE FILM.
Claim 2
Independent Claim
97 words
A METHOD OF MAKING A DIELECTRIC MATERIAL COMPRISING INCORPORATING POLYSTYRENE WITH A COMMINUTED INORGANIC DIELECTRIC MATERIAL BY MIXING THEM UNDER SUCH HEAT AND PRESSURE AS TO LIQUEFY THE POLYSTYRENE AND CAUSE THE POLYSTYRENE TO COAT THE DIELECTRIC MATERIAL, WHILE THE POLYSTYRENE IS STILL LIQUID, ADDING TO THE MIXTURE A LIQUID WHICH WILL WET THE POLYSTYRENE BUT WHICH IS A NON-SOLVENT FOR POLYSTYRENE TO OBTAIN A DIELECTRIC COATING COMPOSITION OF THE REQUIRED VISCOSITY, APPLYING THIS COMPOSITION TO A FILM OF POLYSTYRENE, DRYING AND CALENDERING THE COATED FILM, AND HEATING THE FILM TO RELIEVE THE STRAINS IN THE FILM.
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) | 1953-03-27 | 1953-09-26 | 1954-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-27 | 1957-09-26 | 1958-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-27 | 1961-09-26 | 1962-03-28 | $7700.00 | Window Closed / Lapsed |