US3608452A
Expired / Lapsed
US
⏱️ 0.0 years remaining
2x crt record and display lens
Assignee: 3M Co
•
Filing: 1968-10-16
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Granted: 1971-09-28
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Expires: 1988-10-16
Abstract
Abstract A DISPLAY-PRINT MODULE FOR VIEWING AND RECORDING IMAGES FROM A SMALL CATHODE-RAY TUBE. THE MODULE INCLUDES A FAST, HIGH RESOLUTION MAGNIFYING PROJECTION LENS WITH A LARGE RELATIVE APERTURE FOR USE IN PROJECTING IMAGES FROM A CATHODE RAY TUBE TO A REAR PROJECTION SCREEN OF FILM PLANE. THE LENS HAS A LARGE ELEMENT NEAR THE TUBE TO GATHER LIGHT WITH GOOD CORRECTION FOR THE LENS.
Inventors
- 👤 Lawrence H Conrad
- 👤 David C Gilkeson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:31
CPC Classifications
G; G02; G02B; G02B13/00; G02B13/16
Claims Analysis
Total Claims: 0
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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) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |