Patent US2785144A successfully refreshed from Google Patents.
US2785144A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resinous impregnating varnish and article produced therefrom
Assignee: Westinghouse Electric Corp
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Filing: 1953-02-13
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Granted: 1957-03-12
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Expires: 1973-02-13
Abstract
No abstract record available.
Inventors
- 👤 Joseph J Wachter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:21
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
A RESINOUS VARNISH ADAPTED FOR IMPREGNATION INTO FIBROUS BASE MATERIAL COMPRISING A PHENOLIC RESIN DERIVED BY REACTING A PHENOL SELECTED FROM AT LEAST ONE OF THE GROUP CONSISTING OF PHENOL, CRESOL, AND XYLENOL AND AN ALDEHYDE SELECTED FROM THE GROUP CONSTISTING OF FORMALDEHYDE AND POLYMERS OF FORMALDEHYDE, A SOLVENT FOR SAID RESIN, ZINC BORATE DISPERSED IN THE VARNISH IN AN AMOUNT OF FROM 5% TO 30% BY WEIGHT, BASED ON THE WEIGHT OF THE RESIN, AND A ESTABILIZING AGENT IN A SMALL BUT EFFECTIVE AMOUNT UP TO 1% BY WEIGHT, BASED ON THE WEIGHT OF THE VARNISH, TO MAINTAIN THE ZINC BORATE EVENLY DISPERSED THROUGHOUT THE VARNISH, THE STABILIZING AGENT BEING CITRIC ACID.
Claim 2
Dependent Claim
113 words
A RESINOUS VARNISH ADAPTED FOR IMPREGNATION INTO FIBROUS BASE MATERIAL COMPRISING A PHENOLIC RESIN DERIVED BY REACTING A PHENOL SELECTED FROM AT LEAST ONE OF THE GROUP CONSISTING OF PHENOL, CRESOL, AND XYLENOL AND AN ALDEHYDE SELECTED FROM THE GROUP CONSTISTING OF FORMALDEHYDE AND POLYMERS OF FORMALDEHYDE, A SOLVENT FOR SAID RESIN, ZINC BORATE DISPERSED IN THE VARNISH IN AN AMOUNT OF FROM 5% TO 30% BY WEIGHT, BASED ON THE WEIGHT OF THE RESIN, AND A ESTABILIZING AGENT IN A SMALL BUT EFFECTIVE AMOUNT UP TO 1% BY WEIGHT, BASED ON THE WEIGHT OF THE VARNISH, TO MAINTAIN THE ZINC BORATE EVENLY DISPERSED THROUGHOUT THE VARNISH, THE STABILIZING AGENT BEING CITRIC ACID.
References Cited (Backward Citations)
GB182886A
Cited
US2519388A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-03-11 | 1960-09-10 | 1961-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-03-11 | 1964-09-10 | 1965-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-03-11 | 1968-09-10 | 1969-03-12 | $7700.00 | Window Closed / Lapsed |