Patent US3189681A successfully refreshed from Google Patents.
US3189681A
Expired / Lapsed
US
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Angular channel-shaped coil insulation
Assignee: Westinghouse Electric Corp
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Filing: 1960-03-11
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Granted: 1965-06-15
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Expires: 1980-03-11
Abstract
No abstract record available.
Inventors
- 👤 Lanis E Feather
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:30
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/28; H01F27/32; H01F27/324; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1043; Y10T156/1044
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
110 words
AN ANGULAR CHANNEL-SHAPED ELECTRICALLY INSULATING MEMBER CONSISTING ESSENTIALLY OF A PLURALITY OF PLIES OF HIGH DENSITY CREPED KRAFT PAPER SHEETING HAVING ABOUT 30 TO 40 CRIMPS PER INCH, EACH OF SAID PILES HAVING AN ORIGINAL THICKNESS OF FROM ABOUT 40 MILS TO ABOUT 50 MILS AND A STRETCH OF AT LEAST 200%, A POLYVINYL ACETATE RESIN BONDING THE PLIES OF CREPED PAPER INTO A UNITARY MEMBER, SAID MEMBER HAVING SIDE WALLS DEPENDING FROM A BOTTOM WALL THEREBY DEFINING A U-SHAPED CHANNEL, SAID BOTTOM WALL CURVED TO DEFINE AN ANGLE OF ABOUT 40* TO ABOUT 130*, AND SAID CRIMPS IN EACH PLY DISPOSED ESSENTIALLY LATERALLY WITH RESPECT TO SAID BOTTOM WALL.
References Cited (Backward Citations)
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US1488504A
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US1735684A
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US2025540A
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US2135315A
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US2576864A
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US2754355A
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US2749525A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-06-14 | 1968-12-14 | 1969-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-14 | 1972-12-14 | 1973-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-14 | 1976-12-14 | 1977-06-15 | $7700.00 | Window Closed / Lapsed |