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US3421233A
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Vision training device and method for achieving parallel sightings
Assignee: Individual
•
Filing: 1966-10-05
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Granted: 1969-01-14
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Expires: 1986-10-05
Abstract
No abstract record available.
Inventors
- 👤 Arpad Gaal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:27
CPC Classifications
G; G09; G09B; G09B17/00; G09B17/04; G02; G02C; G02C5/00; G02C5/001; G02C7/00; G02C7/16; G02C9/00; G02C9/04; G02C2202/00; G02C2202/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US735924A
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US2005649A
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US2120727A
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US2172287A
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GB774137A
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US2875670A
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US3352288A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-14 | 1972-07-15 | 1973-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-14 | 1976-07-15 | 1977-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-14 | 1980-07-15 | 1981-01-14 | $7700.00 | Window Closed / Lapsed |