US2721259A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and system for signalling having spectral modulation
Assignee: Raytheon Co
•
Filing: 1952-05-31
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Granted: 1955-10-18
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Expires: 1972-05-31
Abstract
No abstract record available.
Inventors
- 👤 Maxwell R Krasno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:15
CPC Classifications
H; H04; H04B; H04B10/00; G; G01; G01J; G01J3/00; G01J3/12; G01J3/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1854003A
Cited
US1997628A
Cited
GB489357A
Cited
US2443258A
Cited
US2423254A
Cited
US2648249A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-17 | 1959-04-18 | 1959-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-17 | 1963-04-18 | 1963-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-17 | 1967-04-18 | 1967-10-18 | $7700.00 | Window Closed / Lapsed |