US2981867A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric relay
Assignee: General Electric Co
•
Filing: 1957-10-25
•
Granted: 1961-04-25
•
Expires: 1977-10-25
Abstract
No abstract record available.
Inventors
- 👤 Ernest J Hopkins
- 👤 Ronald H Macpherson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:54
CPC Classifications
H; H02; H02H; H02H3/00; H02H3/40; H02H3/08; H02H3/081; H02H3/38
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
AT169748B
Cited
US2201829A
Cited
DE717579C
Cited
GB566805A
Cited
US2511680A
Cited
CH299502A
Cited
US2775725A
Cited
CH308663A
Cited
US2804578A
Cited
US2845581A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-24 | 1964-10-24 | 1965-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-24 | 1968-10-24 | 1969-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-24 | 1972-10-24 | 1973-04-25 | $7700.00 | Window Closed / Lapsed |