US2833997A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Locking attachment for electric extension cords
Assignee: Individual
•
Filing: 1955-04-25
•
Granted: 1958-05-06
•
Expires: 1975-04-25
Abstract
No abstract record available.
Inventors
- 👤 Vincent C Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 01:18
CPC Classifications
H; H02; H02G; H02G11/00; H02G11/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1304075A
Cited
US2066770A
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US2005475A
Cited
US2015953A
Cited
US2129914A
Cited
US2409732A
Cited
US2398626A
Cited
US2447783A
Cited
US2690542A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-05-05 | 1961-11-04 | 1962-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-05 | 1965-11-04 | 1966-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-05 | 1969-11-04 | 1970-05-06 | $7700.00 | Window Closed / Lapsed |