Patent US3513459A successfully refreshed from Google Patents.
US3513459A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple stationed and independently selective transducer system
Assignee: Unisys Corp
•
Filing: 1967-04-28
•
Granted: 1970-05-19
•
Expires: 1987-04-28
Abstract
No abstract record available.
Inventors
- 👤 Michael I Behr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:10
CPC Classifications
G; G11; G11B; G11B27/00; G11B27/002; G11B15/00; G11B15/02; G11B15/12
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2941190A
Cited
US3209339A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-05-18 | 1973-11-17 | 1974-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-18 | 1977-11-17 | 1978-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-18 | 1981-11-17 | 1982-05-19 | $7700.00 | Window Closed / Lapsed |