US2622141A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signaling system
Assignee: Individual
•
Filing: 1949-10-27
•
Granted: 1952-12-16
•
Expires: 1969-10-27
Abstract
No abstract record available.
Inventors
- 👤 Oberman Roelof Maarten Marie
- 👤 Snijders Antonie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:07
CPC Classifications
H; H04; H04Q; H04Q1/00; H04Q1/18; H04Q1/30; H04Q1/38; H04M; H04M1/00; H04M1/02; H04M1/23
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1982290A
Cited
FR792731A
Cited
GB546304A
Cited
US2364771A
Cited
US2349129A
Cited
US2347108A
Cited
US2400148A
Cited
US2512639A
Cited
US2440249A
Cited
US2431904A
Cited
US2489576A
Cited
US2564766A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-16 | 1956-06-16 | 1956-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-16 | 1960-06-16 | 1960-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-16 | 1964-06-16 | 1964-12-16 | $7700.00 | Window Closed / Lapsed |