US2831396A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical system with interchangeable components for variation of image scale
Assignee: Jos Schneider Optische Werke GmbH
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Filing: 1955-10-20
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Granted: 1958-04-22
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Expires: 1975-10-20
Abstract
No abstract record available.
Inventors
- 👤 Klemt Gunter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:39
CPC Classifications
G; G02; G02B; G02B15/00; G02B15/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US583336A
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US660202A
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DE472234C
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US2117252A
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US2169130A
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US2662447A
Cited
FR1097695A
Cited
FR1102390A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-04-21 | 1961-10-21 | 1962-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-21 | 1965-10-21 | 1966-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-21 | 1969-10-21 | 1970-04-22 | $7700.00 | Window Closed / Lapsed |