Patent US2469407A successfully refreshed from Google Patents.
US3497705A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mask alignment system using radial patterns and flying spot scanning
Assignee: Northrop Grumman Guidance and Electronics Co Inc
•
Filing: 1968-02-12
•
Granted: 1970-02-24
•
Expires: 1988-02-12
Abstract
No abstract record available.
Inventors
- 👤 Alan J Adler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:54
CPC Classifications
G; G03; G03F; G03F9/00; G03F9/70; G05; G05D; G05D3/00; G05D3/12; G05D3/14; H; H10; H10P; H10P72/00; H10P72/50; H10P72/53
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-23 | 1973-08-25 | 1974-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-23 | 1977-08-25 | 1978-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-23 | 1981-08-25 | 1982-02-24 | $7700.00 | Window Closed / Lapsed |