US3847484A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Schlieren optical system employing a laser light source
Assignee: Beckman Coulter Inc
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Filing: 1973-02-28
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Granted: 1974-11-12
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Expires: 1993-02-28
Abstract
Abstract This invention provides an improved schlieren optical system for use in analytical ultracentrifuges. The improvement comprises substituting a source of laser light in combination with a focusing lens and a cylinder lens in place of the conventional line source of light in the schlieren optical system. An advantage of the invention is that laser light is more intense than other light and does not require water cooling.
Inventors
- 👤 M Galasso
- 👤 L Gropper
- 👤 D Durland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:09
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/41; G01N21/45; G01N21/455
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
In a schlieren optical system comprising a source of light and in consecutive order from said source of light, a collimating lens, a condensing lens, a schlieren analyzer, a camera lens, a cylinder lens, and an image screen, the improvement wherein the source of light is a source of laser light and the system includes a focusing lens and a second cylinder lens between the source of light and the collimating lens of the schlieren system, the focal plane of the focusing lens being at the focal plane of the collimating lens of the schlieren system and the second cylinder lens being located at a point between the collimating lens and the focal plane of the focusing lens.
Claim 2
Dependent Claim
118 words
In a schlieren optical system comprising a source of light and in consecutive order from said source of light, a collimating lens, a condensing lens, a schlieren analyzer, a camera lens, a cylinder lens, and an image screen, the improvement wherein the source of light is a source of laser light and the system includes a focusing lens and a second cylinder lens between the source of light and the collimating lens of the schlieren system, the focal plane of the focusing lens being at the focal plane of the collimating lens of the schlieren system and the second cylinder lens being located at a point between the collimating lens and the focal plane of the focusing lens.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-11 | 1978-05-13 | 1978-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-11 | 1982-05-13 | 1982-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-11 | 1986-05-13 | 1986-11-12 | $7700.00 | Window Closed / Lapsed |