Patent US2789460A successfully refreshed from Google Patents.
US2789460A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Folding stereoscopic viewer
Assignee: Individual
•
Filing: 1954-01-18
•
Granted: 1957-04-23
•
Expires: 1974-01-18
Abstract
No abstract record available.
Inventors
- 👤 Kaufman Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:52
CPC Classifications
G; G02; G02B; G02B30/00; G02B30/20; G02B30/34; G02B30/37
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US12451A
Cited
US1221836A
Cited
FR529770A
Cited
US1655989A
Cited
US2071120A
Cited
US2662442A
Cited
US2643578A
Cited
US2696754A
Cited
US2768554A
Cited
US2724991A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-04-22 | 1960-10-22 | 1961-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-22 | 1964-10-22 | 1965-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-22 | 1968-10-22 | 1969-04-23 | $7700.00 | Window Closed / Lapsed |