US3544801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mask design for optical alignment systems
Assignee: Fairchild Semiconductor Corp
•
Filing: 1969-05-01
•
Granted: 1970-12-01
•
Expires: 1989-05-01
Abstract
No abstract record available.
Inventors
- 👤 Rudolph H Dyck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:28
CPC Classifications
G; G03; G03F; G03F9/00; G03F9/70; G03F9/7073; G03F9/7076
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US3038369A
Cited
US3207904A
Cited
US3299273A
Cited
US3395287A
Cited
US3309958A
Cited
US3448280A
Cited
US3497705A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-30 | 1974-06-01 | 1974-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-30 | 1978-06-01 | 1978-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-30 | 1982-06-01 | 1982-12-01 | $7700.00 | Window Closed / Lapsed |