US2996667A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spectrum analyzer
Assignee: AT&T Inc
•
Filing: 1959-12-18
•
Granted: 1961-08-15
•
Expires: 1979-12-18
Abstract
No abstract record available.
Inventors
- 👤 Robert R Galbreath
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:05
CPC Classifications
G; G01; G01R; G01R23/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2521130A
Cited
US2455052A
Cited
US2403982A
Cited
US2429229A
Cited
US2606972A
Cited
US2911600A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-14 | 1965-02-13 | 1965-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-14 | 1969-02-13 | 1969-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-14 | 1973-02-13 | 1973-08-15 | $7700.00 | Window Closed / Lapsed |