US3316178A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermostable dielectric material
Assignee: Allis Chalmers Corp
•
Filing: 1964-11-12
•
Granted: 1967-04-25
•
Expires: 1984-11-12
Abstract
No abstract record available.
Inventors
- 👤 James E Millington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:24
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/03; D21H17/05; D21H17/07; H; H01; H01B; H01B3/00; H01B3/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
A THERMALLY UPGRADED CELLULOSIC PAPER DIELECTRIC FOR TRANSFORMERS OF THE TYPE OPERATED IN A PETROLEUM OIL ENVIRONMENT COMPRISING A CELLULOSIC PAPER DIELECTRIC IMPREGNATED WITH AN AMINE SELECTED FROM THE GROUP CONSISTING OF EHTANOLAMINE, DIETHANOLAMINE, TRIETHANOLAMINE, METHYLETHANOLAMINE, METHYDIETHANOLAMINE, 1,1-DIMETHYLAMINO-2-PROPANOL, T-BUTYLAMINOETHANOL, TETRAKIS-(2-HYDROXYETHYL)-ETHYLENEDIAMINE TRIS-HYDROXYMETHYLAMINOMETHANE, TETRA (2-HYDROXYPORPYL) EHTYLENEDIAMINE, 9-DIETHANOLAMINE-10-HYDROXYSTEARYLAMINE, AND 1,9-BIS (DIETHANOLAMINE) 10-HYDROXYOCTADECANE IN AN AMOUNT SUCH THAT SAID CELLULOSIC PAPER DIELECTRIC HAS AN AMINO NITROGEN CONTECT OF FROM ABOUT 0.2% TO ABOUT 1.0% BY WEIGHT.
Claim 2
Dependent Claim
72 words
A THERMALLY UPGRADED CELLULOSIC PAPER DIELECTRIC FOR TRANSFORMERS OF THE TYPE OPERATED IN A PETROLEUM OIL ENVIRONMENT COMPRISING A CELLULOSIC PAPER DIELECTRIC IMPREGNATED WITH AN AMINE SELECTED FROM THE GROUP CONSISTING OF EHTANOLAMINE, DIETHANOLAMINE, TRIETHANOLAMINE, METHYLETHANOLAMINE, METHYDIETHANOLAMINE, 1,1-DIMETHYLAMINO-2-PROPANOL, T-BUTYLAMINOETHANOL, TETRAKIS-(2-HYDROXYETHYL)-ETHYLENEDIAMINE TRIS-HYDROXYMETHYLAMINOMETHANE, TETRA (2-HYDROXYPORPYL) EHTYLENEDIAMINE, 9-DIETHANOLAMINE-10-HYDROXYSTEARYLAMINE, AND 1,9-BIS (DIETHANOLAMINE) 10-HYDROXYOCTADECANE IN AN AMOUNT SUCH THAT SAID CELLULOSIC PAPER DIELECTRIC HAS AN AMINO NITROGEN CONTECT OF FROM ABOUT 0.2% TO ABOUT 1.0% BY WEIGHT.
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) | 1970-04-24 | 1970-10-24 | 1971-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-04-24 | 1974-10-24 | 1975-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-04-24 | 1978-10-24 | 1979-04-25 | $7700.00 | Window Closed / Lapsed |