US3506331A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical waveguide
Assignee: AT&T Inc
•
Filing: 1967-10-03
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Granted: 1970-04-14
•
Expires: 1987-10-03
Abstract
No abstract record available.
Inventors
- 👤 Rudolf Kompfner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:30
CPC Classifications
H; H01; H01P; H01P3/00; H01P3/20; G; G02; G02B; G02B6/00; G02B6/10
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) | 1973-04-13 | 1973-10-13 | 1974-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-04-13 | 1977-10-13 | 1978-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-04-13 | 1981-10-13 | 1982-04-14 | $7700.00 | Window Closed / Lapsed |