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Patent US2675434A successfully refreshed from Google Patents.
US2675434A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Trolley duct
Assignee: Bulldog Electric Products Co
•
Filing: 1950-05-25
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Granted: 1954-04-13
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Expires: 1970-05-25
Abstract
No abstract record available.
Inventors
- 👤 John A Herrmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:52
CPC Classifications
H; H02; H02G; H02G5/00; H02G5/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2048378A
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US2090725A
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US2096579A
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US2120251A
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US2304924A
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US2144872A
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US2170300A
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US2358116A
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US2322799A
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US2495526A
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US2481194A
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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) | 1957-04-12 | 1957-10-12 | 1958-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-12 | 1961-10-12 | 1962-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-12 | 1965-10-12 | 1966-04-13 | $7700.00 | Window Closed / Lapsed |