Patent US2838601A successfully refreshed from Google Patents.
US2838601A
Expired / Lapsed
US
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Optical system
Assignee: Allen B du Mont Laboratories Inc
•
Filing: 1955-10-25
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Granted: 1958-06-10
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Expires: 1975-10-25
Abstract
No abstract record available.
Inventors
- 👤 Robert T Cavanagh
- 👤 Jesse H Haines
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:55
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N5/84; G; G02; G02B; G02B21/00; G02B21/02; G02B21/025; G03; G03B; G03B19/00; G03B19/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2698356A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-09 | 1961-12-09 | 1962-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-09 | 1965-12-09 | 1966-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-09 | 1969-12-09 | 1970-06-10 | $7700.00 | Window Closed / Lapsed |