Patent US2991336A successfully refreshed from Google Patents.
US2991336A
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US
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Electrical trolley systems, low reactance type
Assignee: Insul 8 Corp
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Filing: 1956-09-10
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Granted: 1961-07-04
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Expires: 1976-09-10
Abstract
No abstract record available.
Inventors
- 👤 John B Shaw
- 👤 Cecil J Mayo
- 👤 Tirey L Ford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:15
CPC Classifications
B; B60; B60M; B60M1/00; B60M1/30; B60M1/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US907712A
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US1625125A
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US1672915A
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US2038240A
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US2427475A
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US2668199A
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US2614179A
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US2675434A
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US2767241A
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US2704309A
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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) | 1964-07-03 | 1965-01-02 | 1965-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-03 | 1969-01-02 | 1969-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-03 | 1973-01-02 | 1973-07-04 | $7700.00 | Window Closed / Lapsed |