US2831395A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gaussian dual objective with four air-spaced members
Assignee: Jos Schneider Optische Werke GmbH
•
Filing: 1955-03-25
•
Granted: 1958-04-22
•
Expires: 1975-03-25
Abstract
No abstract record available.
Inventors
- 👤 Klemt Gunter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:55
CPC Classifications
G; G02; G02B; G02B9/00; G02B9/34
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US583336A
Cited
US2117252A
Cited
US2171640A
Cited
US2389016A
Cited
US2487749A
Cited
US2672788A
Cited
US2683395A
Cited
US2670659A
Cited
US2683398A
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 |