US2490038A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical signaling system
Assignee: International Standard Electric Corp
•
Filing: 1943-01-22
•
Granted: 1949-12-06
•
Expires: 1963-01-22
Abstract
No abstract record available.
Inventors
- 👤 Vriendt Charles De
- 👤 Lucien A B Cabes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:36
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q1/00; H04Q1/18; H04Q1/30; H04Q1/44; H04Q1/444; H04Q1/446; H04Q1/4465
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1977256A
Cited
US2177843A
Cited
US2270246A
Cited
US2284870A
Cited
US2319424A
Cited
US2252766A
Cited
NL55722C
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-05 | 1953-06-06 | 1953-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-05 | 1957-06-06 | 1957-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-05 | 1961-06-06 | 1961-12-06 | $7700.00 | Window Closed / Lapsed |