Patent US4324459A successfully refreshed from Google Patents.
US4324459A
Expired / Lapsed
US
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Optical test pattern
Assignee: United States Department of the Army
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Filing: 1980-01-24
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Granted: 1982-04-13
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Expires: 2000-01-24
Abstract
Abstract A stelliform arrangement of sectors each having a uniform optical density and with different sectors having different optical densities.
Inventors
- 👤 Reinhold Gerharz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:23
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/02; A61B3/09; A61B3/06; A61B3/063
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
30 words
An optical test pattern having wedge-shaped regions in a predetermined arrangement, wherein each of said regions is of uniform optical density but wherein different regions are of different optical densities.
Claim 2
Dependent Claim
30 words
An optical test pattern having wedge-shaped regions in a predetermined arrangement, wherein each of said regions is of uniform optical density but wherein different regions are of different optical densities.
Claim 3
Dependent Claim
12 words
The pattern as defined in claim 1 wherein said pattern is stelliform.
References Cited (Backward Citations)
US2463813A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-04-12 | 1985-10-12 | 1986-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-04-12 | 1989-10-12 | 1990-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-04-12 | 1993-10-12 | 1994-04-13 | $7700.00 | Window Closed / Lapsed |