US2822855A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing a high density paper
Assignee: Sprague Electric Co
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Filing: 1952-06-19
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Granted: 1958-02-11
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Expires: 1972-06-19
Abstract
No abstract record available.
Inventors
- 👤 Reavis C Sproull
- 👤 Duane L Kenaga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:17
CPC Classifications
B; B31; B31F; B31F1/00; B31F1/36; D; D21; D21G; D21G1/00; D21H; D21H27/00; D21H27/30; D21H11/00; D21H11/02; D21H11/04; D21H17/00; D21H17/63; D21H23/00; D21H23/02; D21H23/22; D21H23/50; D21H23/52; D21H23/56; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31971; Y10T428/31993
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
A METHOD FOR PRODUCING A PAPER DIELECTRIC HAVING A DENSITY OF AT LEAST ABOUT 1.1 GRAMS PER CUBIC CENTIMETER, SAID METHOD COMPRISING SUPPLYING A PAPER HAVING A DENSITY OF NOT MORE THAN 1 GRAM PER CUBIC CENTIMETER AND SUPERCALENDERING A PLURAALITY OF LAYERS OF SUCH PAPER TOGETHER IN A SUPERCALENDER HAVING ROLLS HEATED TO AT LEAST ABOUT 100* C. WHILE MOISTENING SAID LAYERS, AS THEY ENTER THE NIPS, TO A MOISTURE CONTENT OF AT LEAST 10% BASED ON THE DRY WEIGHT OF THE PAPER, TO CAUSE THE ROLLING TO DRY AND PERMANENTLY UNITE THE LAYERS INTO A SINGLE SHEET.
Claim 2
Independent Claim
99 words
A METHOD FOR PRODUCING A PAPER DIELECTRIC HAVING A DENSITY OF AT LEAST ABOUT 1.1 GRAMS PER CUBIC CENTIMETER, SAID METHOD COMPRISING SUPPLYING A PAPER HAVING A DENSITY OF NOT MORE THAN 1 GRAM PER CUBIC CENTIMETER AND SUPERCALENDERING A PLURAALITY OF LAYERS OF SUCH PAPER TOGETHER IN A SUPERCALENDER HAVING ROLLS HEATED TO AT LEAST ABOUT 100* C. WHILE MOISTENING SAID LAYERS, AS THEY ENTER THE NIPS, TO A MOISTURE CONTENT OF AT LEAST 10% BASED ON THE DRY WEIGHT OF THE PAPER, TO CAUSE THE ROLLING TO DRY AND PERMANENTLY UNITE THE LAYERS INTO A SINGLE SHEET.
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) | 1961-02-10 | 1961-08-12 | 1962-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-10 | 1965-08-12 | 1966-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-10 | 1969-08-12 | 1970-02-11 | $7700.00 | Window Closed / Lapsed |