US2549870A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stopping mechanism
Assignee: STC PLC
•
Filing: 1946-03-09
•
Granted: 1951-04-24
•
Expires: 1966-03-09
Abstract
No abstract record available.
Inventors
- 👤 Fred C Wallace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:07
CPC Classifications
H; H02; H02P; H02P3/00; H02P3/06; H02P3/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1848761A
Cited
US1272337A
Cited
FR583250A
Cited
US1871672A
Cited
US1834448A
Cited
US2351997A
Cited
US2454789A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-23 | 1954-10-23 | 1955-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-23 | 1958-10-23 | 1959-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-23 | 1962-10-23 | 1963-04-24 | $7700.00 | Window Closed / Lapsed |