Patent US2660906A successfully refreshed from Google Patents.
Patent US3250837A successfully refreshed from Google Patents.
US3250837A
Expired / Lapsed
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Method of molding insulated coils by application of differential fluid pressure
Assignee: Hitachi Ltd
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Filing: 1963-01-15
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Granted: 1966-05-10
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Expires: 1983-01-15
Abstract
No abstract record available.
Inventors
- 👤 Inoue Toshio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:11
CPC Classifications
H; H02; H02K; H02K15/00; H02K15/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
A METHOD OF FORMING INSULATED COILS WHICH COMPRISES THE STEPS, IN THE ORDER AS NAMED, OF VACUUM DRYING AN ELECTRICAL CONDUCTOR COVERED WITH AN INSULATOR IN SHEET FORM; INJECTING A DEGASSED SOLVENTLESS VARNISH THEREIN; ENCLOSING THE CONDUCTOR THUS TREATED WITH A FLEXIBLE LIQUIDAND GAS-IMPERMEABLE SHEET OF A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF POLETHYLENE TETREPHTHALATE AND POLYTETRAFLUOROETHYLENE; SEALING SAID SHEET; AND HEATING THE COILS THUS ENCLOSED IN OIL AT A PRESSURE OF 15 TO 2,000 KG./CM2 THEREBY CAUSING SAID COILS TO HARDEN.
Claim 2
Independent Claim
83 words
A METHOD OF FORMING INSULATED COILS WHICH COMPRISES THE STEPS, IN THE ORDER AS NAMED, OF VACUUM DRYING AN ELECTRICAL CONDUCTOR COVERED WITH AN INSULATOR IN SHEET FORM; INJECTING A DEGASSED SOLVENTLESS VARNISH THEREIN; ENCLOSING THE CONDUCTOR THUS TREATED WITH A FLEXIBLE LIQUIDAND GAS-IMPERMEABLE SHEET OF A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF POLETHYLENE TETREPHTHALATE AND POLYTETRAFLUOROETHYLENE; SEALING SAID SHEET; AND HEATING THE COILS THUS ENCLOSED IN OIL AT A PRESSURE OF 15 TO 2,000 KG./CM2 THEREBY CAUSING SAID COILS TO HARDEN.
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) | 1969-05-09 | 1969-11-08 | 1970-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-09 | 1973-11-08 | 1974-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-09 | 1977-11-08 | 1978-05-10 | $7700.00 | Window Closed / Lapsed |