US2929044A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Universal trolley duct connecting means
Assignee: Bulldog Electric Products Co
•
Filing: 1956-05-29
•
Granted: 1960-03-15
•
Expires: 1976-05-29
Abstract
No abstract record available.
Inventors
- 👤 John A Herrmann
- 👤 Russell S Davis
- 👤 George H Farnsworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:27
CPC Classifications
H; H02; H02G; H02G5/00; H02G5/04
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1145338A
Cited
US2043796A
Cited
US2392438A
Cited
US2437339A
Cited
US2585770A
Cited
US2578436A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-15 | 1963-09-14 | 1964-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-15 | 1967-09-14 | 1968-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-15 | 1971-09-14 | 1972-03-15 | $7700.00 | Window Closed / Lapsed |