US2538020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Relay
Assignee: STC PLC
•
Filing: 1947-10-11
•
Granted: 1951-01-16
•
Expires: 1967-10-11
Abstract
No abstract record available.
Inventors
- 👤 Lomholt Carl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:03
CPC Classifications
H; H01; H01H; H01H51/00; H01H51/02; H01H51/04; H01H51/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US772591A
Cited
US1804086A
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US1865237A
Cited
US2300868A
Cited
US2258122A
Cited
US2282066A
Cited
US2279395A
Cited
US2373479A
Cited
US2425275A
Cited
US2444198A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-15 | 1954-07-17 | 1955-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-15 | 1958-07-17 | 1959-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-15 | 1962-07-17 | 1963-01-16 | $7700.00 | Window Closed / Lapsed |