Patent US2981813A successfully refreshed from Google Patents.
US2981813A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum switch
Assignee: Jennings Radio Manufacturing Corp
•
Filing: 1958-07-21
•
Granted: 1961-04-25
•
Expires: 1978-07-21
Abstract
No abstract record available.
Inventors
- 👤 Jennings Jo Emmett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:28
CPC Classifications
H; H01; H01H; H01H33/00; H01H33/60; H01H33/66; H01H33/662; H01H33/66238; H01H2033/66253
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1008625A
Cited
US1743949A
Cited
US1783279A
Cited
US1754228A
Cited
US1814851A
Cited
GB389463A
Cited
US2049747A
Cited
US2180661A
Cited
US2472625A
Cited
GB787846A
Cited
US2794101A
Cited
US2773154A
Cited
US2843701A
Cited
US2897322A
Cited
US2872550A
Cited
US2908780A
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 |