Patent US2931116A successfully refreshed from Google Patents.
US2931116A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slide projector tray
Assignee: Bausch and Lomb Inc
•
Filing: 1958-03-18
•
Granted: 1960-04-05
•
Expires: 1978-03-18
Abstract
No abstract record available.
Inventors
- 👤 Olin W Boughton
- 👤 Jr Charles J De Grave
- 👤 Kenneth D Maier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:30
CPC Classifications
G; G03; G03B; G03B23/00; G03B23/02; G03B23/04
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-05 | 1963-10-05 | 1964-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-05 | 1967-10-05 | 1968-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-05 | 1971-10-05 | 1972-04-05 | $7700.00 | Window Closed / Lapsed |