US4058734A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Passive infrared resolution target
Assignee: United States Department of the Air Force
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Filing: 1976-07-19
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Granted: 1977-11-15
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Expires: 1996-07-19
Abstract
Abstract A passive target array, for measuring the resolution of infrared reconnaissance sets, having a heat retaining background pad. A plurality of perforated aluminum strips are laid on the pad in a conventional photographic resolution target configuration.
Inventors
- 👤 Leo O. Vroombout
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:05
CPC Classifications
G; G01; G01J; G01J5/00; G01J5/52; G01J5/53
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
74 words
A passive resolution target array for testing of infrared reconnaissance sets in an area having a substantially normal scene average temperature, comprising: a background pad of heat retaining material; said background pad including means, responsive to solar radiation for providing a pad temperature greater than the scene average temperature; a plurality of perforated aluminum sheets with between 50 and 80 percent open area positioned on said pad in a conventional resolution measurement target configuration.
Claim 2
Dependent Claim
74 words
A passive resolution target array for testing of infrared reconnaissance sets in an area having a substantially normal scene average temperature, comprising: a background pad of heat retaining material; said background pad including means, responsive to solar radiation for providing a pad temperature greater than the scene average temperature; a plurality of perforated aluminum sheets with between 50 and 80 percent open area positioned on said pad in a conventional resolution measurement target configuration.
Claim 3
Dependent Claim
20 words
The device as recited in claim 1 wherein said perforated aluminum sheets have between 60 and 70 percent open area.
Claim 4
Dependent Claim
25 words
The device as recited in claim 2 wherein said background pad includes a fiberglass mat; said mat being saturated with a polyvinyl acetate water emulsion.
References Cited (Backward Citations)
US3597618A
Cited
US3986384A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-11-14 | 1981-05-16 | 1981-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-14 | 1985-05-16 | 1985-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-14 | 1989-05-16 | 1989-11-15 | $7700.00 | Window Closed / Lapsed |