Patent US3474285A successfully refreshed from Google Patents.
US3474285A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Information storage devices
Assignee: AT&T Inc
•
Filing: 1968-03-27
•
Granted: 1969-10-21
•
Expires: 1988-03-27
Abstract
No abstract record available.
Inventors
- 👤 Adolf Goetzberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:29
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/36; H01J29/39; H01J29/45; H01J29/451
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2963604A
Cited
US3087985A
Cited
US3322955A
Cited
US3252030A
Cited
US3202853A
Cited
US3403284A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-20 | 1973-04-21 | 1973-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-20 | 1977-04-21 | 1977-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-20 | 1981-04-21 | 1981-10-21 | $7700.00 | Window Closed / Lapsed |