Patent US3435230A successfully refreshed from Google Patents.
US3435230A
Expired / Lapsed
US
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Optical information transmission system
Assignee: AT&T Inc
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Filing: 1966-12-08
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Granted: 1969-03-25
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Expires: 1986-12-08
Abstract
No abstract record available.
Inventors
- 👤 Jeofry S Courtney-Pratt
- 👤 Logan E Hargrove
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:27
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/50; H04B10/501; H04B10/503; H04B10/505; H01; H01S; H01S3/00; H01S3/10; H01S3/106; H01S3/1068; H04B10/516; H04B10/524; H04B10/548; H04B10/556; H04B10/5563
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-03-24 | 1972-09-23 | 1973-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-24 | 1976-09-23 | 1977-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-24 | 1980-09-23 | 1981-03-25 | $7700.00 | Window Closed / Lapsed |