US3453035A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical system with diffraction grating screen
Assignee: Mark Systems Inc
•
Filing: 1963-11-04
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Granted: 1969-07-01
•
Expires: 1983-11-04
Abstract
No abstract record available.
Inventors
- 👤 Adriaan Walther
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:10
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/42; G02B27/4205
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2589014A
Cited
US2846918A
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GB800303A
Cited
US2891444A
Cited
US2977847A
Cited
FR1196772A
Cited
US3195432A
Cited
FR1263557A
Cited
US3180216A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-30 | 1972-12-30 | 1973-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-30 | 1976-12-30 | 1977-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-30 | 1980-12-30 | 1981-07-01 | $7700.00 | Window Closed / Lapsed |