US3544790A
Expired / Lapsed
US
⏱️ 0.0 years remaining
An electron beam masking arrangement
Assignee: AT&T Inc
•
Filing: 1968-03-01
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Granted: 1970-12-01
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Expires: 1988-03-01
Abstract
No abstract record available.
Inventors
- 👤 Martin J Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:41
CPC Classifications
B; B05; B05D; B05D1/00; B05D1/32; B05D3/00; B05D3/06; B05D3/068; G; G03; G03F; G03F1/00; G03F1/20; G03F7/00; G03F7/26; G03F7/34; Y; Y10; Y10S; Y10S430/00; Y10S430/143
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
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 |