Patent US3135627A successfully refreshed from Google Patents.
US3135627A
Expired / Lapsed
US
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Thermally stabilized cellulose materials for electrical insulation
Assignee: McGraw Edison Co
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Filing: 1961-08-08
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Granted: 1964-06-02
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Expires: 1981-08-08
Abstract
No abstract record available.
Inventors
- 👤 Fred S Sadler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:41
CPC Classifications
D; D06; D06M; D06M15/00; D06M15/01; D06M15/03; D06M15/11; D06M13/00; D06M13/322; D06M13/35; D21; D21H; D21H17/00; D21H17/03; D21H17/05; D21H17/07; H; H01; H01B; H01B3/00; H01B3/18; H01B3/185; H01F; H01F27/00; H01F27/28; H01F27/32; H01F27/324
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
A CELLULOSE ELECTRICAL INSULATING MATERIAL FOR USE AT ELEVATED TEMPERATURES HAVING IMPROVED THERMAL STABILITY, COMPRISING A BASE CONSISTING OF CELLULOSE FIBERS IMPREGNATED SOLELY WITH MORPHOLINE, THE DRY IMPREGNATED FIBER BASE HAVING A NITROGEN CONTENT IN THE RANGE OF 0.2% TO 2.0% BY WEIGHT OF THE FIBERS.
Claim 2
Dependent Claim
46 words
A CELLULOSE ELECTRICAL INSULATING MATERIAL FOR USE AT ELEVATED TEMPERATURES HAVING IMPROVED THERMAL STABILITY, COMPRISING A BASE CONSISTING OF CELLULOSE FIBERS IMPREGNATED SOLELY WITH MORPHOLINE, THE DRY IMPREGNATED FIBER BASE HAVING A NITROGEN CONTENT IN THE RANGE OF 0.2% TO 2.0% BY WEIGHT OF THE FIBERS.
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) | 1967-06-02 | 1967-12-02 | 1968-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-02 | 1971-12-02 | 1972-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-02 | 1975-12-02 | 1976-06-02 | $7700.00 | Window Closed / Lapsed |