Patent US2668473A successfully refreshed from Google Patents.
US2668473A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brixner
Assignee: —
•
Filing: —
•
Granted: 1954-02-09
•
Expires: 1971-02-09
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:52
CPC Classifications
G; G03; G03B; G03B39/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2400887A
Cited
GB668681A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-02-08 | 1957-08-10 | 1958-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-08 | 1961-08-10 | 1962-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-08 | 1965-08-10 | 1966-02-09 | $7700.00 | Window Closed / Lapsed |