Patent US5053629A successfully refreshed from Google Patents.
US5053629A
Expired / Lapsed
US
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Microdensitometer with submicron resolution having dual diaphragms and dual microscopes
Assignee: Aerospace Corp
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Filing: 1990-08-23
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Granted: 1991-10-01
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Expires: 2010-08-23
Abstract
Abstract A microdensitometer capable of submicron resolution is achieved by incorporation of adjustable diaphragms situated outside the optics of the microdensitometer.
Inventors
- 👤 James S. Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:35
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/59; G01N21/5907; G01N21/5911
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
139 words
A microdensitometer capable of submicron resolution, comprising: a. a light source; b. a condenser lens; c. an input diaphragm for adjusting an input microscope, disposed on an axis formed by the light source and the condenser lens; d. said input microscope with a predetermined focal plane, disposed on the axis formed by the light source, the condenser lens, and the input diaphragm; e. an output microscope having a clear aperture and an objective, disposed on the same axis as the input microscope, having the same focal plane as the input microscope; f. a sample disposed on said focal plane; g. an output diaphragm for adjusting the clear aperture of the output objective to achieve non-coherent illumination; h. whereby an image of the sample is illuminated by light traveling through the input microscope and is examined by the output microscope.
Claim 2
Dependent Claim
139 words
A microdensitometer capable of submicron resolution, comprising: a. a light source; b. a condenser lens; c. an input diaphragm for adjusting an input microscope, disposed on an axis formed by the light source and the condenser lens; d. said input microscope with a predetermined focal plane, disposed on the axis formed by the light source, the condenser lens, and the input diaphragm; e. an output microscope having a clear aperture and an objective, disposed on the same axis as the input microscope, having the same focal plane as the input microscope; f. a sample disposed on said focal plane; g. an output diaphragm for adjusting the clear aperture of the output objective to achieve non-coherent illumination; h. whereby an image of the sample is illuminated by light traveling through the input microscope and is examined by the output microscope.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-09-30 | 1995-04-01 | 1995-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-09-30 | 1999-04-01 | 1999-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-09-30 | 2003-04-01 | 2003-10-01 | $7700.00 | Window Closed / Lapsed |