US3449577A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Controlled transmission of waves through inhomogeneous media
Assignee: AT&T Inc
•
Filing: 1965-10-23
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Granted: 1969-06-10
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Expires: 1985-10-23
Abstract
No abstract record available.
Inventors
- 👤 Herwig W Kogelnik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:32
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/11; G; G03; G03H; G03H1/00; G03H1/04; G03H1/0402; G03H1/041; Y; Y10; Y10S; Y10S359/00; Y10S359/90
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2982176A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-09 | 1972-12-09 | 1973-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-09 | 1976-12-09 | 1977-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-09 | 1980-12-09 | 1981-06-10 | $7700.00 | Window Closed / Lapsed |