Patent US3561850A successfully refreshed from Google Patents.
US3561850A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical effect generator with television display screen
Assignee: Individual
•
Filing: 1968-06-20
•
Granted: 1971-02-09
•
Expires: 1988-06-20
Abstract
Abstract AN OPTICAL EFFECT GENERATOR UTILIZING A PLURALITY OF LIGHT SOURCES, A PATTERNED LIGHT TRANSMITTING MEDIUM AND A LIGHT DIFFUSING OR REFRACTING MEDIUM. THE ELEMENTS OF THE APPARATUS ARE ARRANGED SUCH THAT THE LIGHT MEDIUM AND THE LIGHT TRANSMITTING MEDIUM ARE INTERPOSED BETWEEN THE VIEWER AND THE LIGHT SOURCES WITH THE DIFFUSING MEDIUM BEING LOCATED BETWEEN THE VIEWER AND THE SLIDE.
Inventors
- 👤 Robert Shaffer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:33
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/72; G; G09; G09F; G09F19/00; G09F19/12; G09F19/18
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |