US2539446A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing dielectric sheets
Assignee: Sprague Electric Co
•
Filing: 1947-07-12
•
Granted: 1951-01-30
•
Expires: 1967-07-12
Abstract
No abstract record available.
Inventors
- 👤 William J Lies
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:48
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/626; C04B35/63; C04B35/632; C04B35/634; C04B35/63448; C04B35/63472; C04B35/6348; C04B33/00; C04B33/02; C04B33/13; C04B33/1315; C04B35/01; C04B35/46
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
IN A METHOD OF PRODUCING DIELECTRIC SHEETS HAVING THICKNESSES OF THE ORDER OF 10 MILS, THE STEPS OF CASTING A THIN FILM FROM A SLIP OF FINELY DIVIDED DIELECTRIC PARTICLES OF A COMPOUND SELECTED FROM THE CLASS CONSISTING OF TITANIUM DIOXIDE AND TITANATES, WHICH SLIP INCLUDES A PARTIALLY POLYMERIZED HYDROPHILLIC CONDENSATION RESIN IN AN AMOUNT OF FROM 5 TO 50 PER CENT BY WEIGHT OF THE DIELECTRIC PARTICLES, DRYING AND CURING THE CAST FILM TO SUBSTANTIALLY COMPLETELY POLYMERIZE THE RESIN, AND THEN FIRING THE CURED FILM TO BURN OFF THE RESIN AND SINTER THE DIELECTRIC PARTICLES TOGETHER.
Claim 2
Dependent Claim
97 words
IN A METHOD OF PRODUCING DIELECTRIC SHEETS HAVING THICKNESSES OF THE ORDER OF 10 MILS, THE STEPS OF CASTING A THIN FILM FROM A SLIP OF FINELY DIVIDED DIELECTRIC PARTICLES OF A COMPOUND SELECTED FROM THE CLASS CONSISTING OF TITANIUM DIOXIDE AND TITANATES, WHICH SLIP INCLUDES A PARTIALLY POLYMERIZED HYDROPHILLIC CONDENSATION RESIN IN AN AMOUNT OF FROM 5 TO 50 PER CENT BY WEIGHT OF THE DIELECTRIC PARTICLES, DRYING AND CURING THE CAST FILM TO SUBSTANTIALLY COMPLETELY POLYMERIZE THE RESIN, AND THEN FIRING THE CURED FILM TO BURN OFF THE RESIN AND SINTER THE DIELECTRIC PARTICLES TOGETHER.
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) | 1954-01-29 | 1954-07-31 | 1955-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-29 | 1958-07-31 | 1959-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-29 | 1962-07-31 | 1963-01-30 | $7700.00 | Window Closed / Lapsed |