US3421809A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for exceeding the cutoff frequency of a band limited optical system
Assignee: International Business Machines Corp
•
Filing: 1965-03-15
•
Granted: 1969-01-14
•
Expires: 1985-03-15
Abstract
No abstract record available.
Inventors
- 👤 Adolf W Lohmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:35
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/58; G02B27/42; G02B27/4205; G02B27/4272; G02B27/4277; G02B27/46
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3191487A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-14 | 1972-07-15 | 1973-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-14 | 1976-07-15 | 1977-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-14 | 1980-07-15 | 1981-01-14 | $7700.00 | Window Closed / Lapsed |