Patent US4938220A successfully refreshed from Google Patents.
Patent US2931027A successfully refreshed from Google Patents.
US2931027A
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Visual display apparatus
Assignee: AT&T Inc
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Filing: 1956-10-19
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Granted: 1960-03-29
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Expires: 1976-10-19
Abstract
No abstract record available.
Inventors
- 👤 Vincent F Blefary
- 👤 Ignatowitz Michael
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:37
CPC Classifications
G; G09; G09F; G09F9/00; G09F9/40; G09F9/405; G03; G03B; G03B21/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US450615A
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US2371120A
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US1219514A
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GB182887A
Cited
US1665426A
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US2515862A
Cited
US2738491A
Cited
US2787785A
Cited
US2794977A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-29 | 1963-09-28 | 1964-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-29 | 1967-09-28 | 1968-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-29 | 1971-09-28 | 1972-03-29 | $7700.00 | Window Closed / Lapsed |