US3517246A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-layered staggered aperture target
Assignee: AT&T Inc
•
Filing: 1967-11-29
•
Granted: 1970-06-23
•
Expires: 1987-11-29
Abstract
No abstract record available.
Inventors
- 👤 Arthur N Chester
- 👤 Merton H Crowell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:51
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/36; H01J29/39
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2415842A
Cited
DE901572C
Cited
FR1009828A
Cited
US2786880A
Cited
US2886739A
Cited
US2980813A
Cited
US3082340A
Cited
US3324327A
Cited
US3409797A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-06-22 | 1973-12-22 | 1974-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-22 | 1977-12-22 | 1978-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-22 | 1981-12-22 | 1982-06-23 | $7700.00 | Window Closed / Lapsed |