US3914025A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microscope condenser
Assignee: C Reichert Optische Werke AG
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Filing: 1973-12-14
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Granted: 1975-10-21
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Expires: 1993-12-14
Abstract
Abstract A 1.30 NA condenser having three components with the first component being a doublet comprised of a plane parallel plate cemented to a hemispherical lens; the second component being a meniscus positive lens and the third component a convex positive triplet is corrected for pupil aberration, especially coma, with a pupil position external to the glass.
Inventors
- 👤 Alois F Dehlink
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:24
CPC Classifications
G; G02; G02B; G02B21/00; G02B21/06; G02B21/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
A microscope condenser having a numerical aperture of 1.30 and composed of the following components: a first component I comprised of a doublet composed of a plane parallel plate cemented to a hemispherical lens; a second component II comprised of a meniscus positive lens; and a third component III, composed of a convex positive triplet in which the parameters of lens radii (R), thicknesses (T), and spacings (S) are expressed in millimeters and a negative sign indicates lens radii on centers of curvature on the object side of the lens
Claim 2
Dependent Claim
90 words
A microscope condenser having a numerical aperture of 1.30 and composed of the following components: a first component I comprised of a doublet composed of a plane parallel plate cemented to a hemispherical lens; a second component II comprised of a meniscus positive lens; and a third component III, composed of a convex positive triplet in which the parameters of lens radii (R), thicknesses (T), and spacings (S) are expressed in millimeters and a negative sign indicates lens radii on centers of curvature on the object side of the lens
References Cited (Backward Citations)
US3790254A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |