US2831391A
Expired / Lapsed
US
⏱️ 0.0 years remaining
culver
Assignee: —
•
Filing: —
•
Granted: 1958-04-22
•
Expires: 1975-04-22
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:27
CPC Classifications
G; G03; G03B; G03B39/00; G03B1/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR361078A
Cited
FR463275A
Cited
US1575133A
Cited
US1613730A
Cited
US1655298A
Cited
US1716990A
Cited
US1760220A
Cited
US1980915A
Cited
US2114608A
Cited
US2163179A
Cited
GB443537A
Cited
US2127143A
Cited
US2142493A
Cited
US2340564A
Cited
US2440797A
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 |