US3390934A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Convection type gaseous lens
Assignee: AT&T Inc
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Filing: 1964-07-28
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Granted: 1968-07-02
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Expires: 1984-07-28
Abstract
No abstract record available.
Inventors
- 👤 Dwight W Berreman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:51
CPC Classifications
H; H01; H01P; H01P3/00; H01P3/20; G; G02; G02B; G02B3/00; G02B3/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-07-02 | 1972-01-01 | 1972-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-02 | 1976-01-01 | 1976-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-02 | 1980-01-01 | 1980-07-02 | $7700.00 | Window Closed / Lapsed |