US4090795A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Double sector cell for an ultra-centrifuge
Assignee: GESELLSCHAFT fur BIOTECHNOLOGISCHE FORSCHUNG (GBF) mbH
•
Filing: 1977-03-02
•
Granted: 1978-05-23
•
Expires: 1997-03-02
Abstract
Abstract The specification describes a double sector cell for ultra-centrifuges. It comprises a tubular housing comprising a lower window holder with a lower window, a cell arrangement and an upper window holder with an upper window. There are radial filling openings, which allow access to one respective cell of the cell arrangement and are closed by sealing plugs. The cell arrangement comprises two sector cell center pieces forming respected pairs of cell chambers. Between the chambers a center window is arranged in a centering ring. The housing has two pairs of filling openings, which when the cell is assembled are flush with the associated filling holes of the center pieces.
Inventors
- 👤 Josef Flossdorf
- 👤 Henning Schillig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:40
CPC Classifications
B; B04; B04B; B04B5/00; B04B5/04; B04B5/0407
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
130 words
A tandem, double-sector analytical cell for an ultra-centrifuge comprising a tubular housing, a lower window maintained in said housing by a lower window holder, an upper window maintained in said housing by an upper window holder and a specimen cell assembly maintained between said upper and lower windows, said assembly including a center window, a centering ring surrounding said center window, and first and second sector cell centerpieces located on opposite sides of said center window, each having a pair of sector cell chambers and filling holes connected to said chambers, said housing including radial filling opening aligned with said filling holes and adapted to be closed by sealing plugs, said sector cell chambers being arranged for series transmission of light through respective chambers in said first and second centerpieces.
Claim 2
Dependent Claim
130 words
A tandem, double-sector analytical cell for an ultra-centrifuge comprising a tubular housing, a lower window maintained in said housing by a lower window holder, an upper window maintained in said housing by an upper window holder and a specimen cell assembly maintained between said upper and lower windows, said assembly including a center window, a centering ring surrounding said center window, and first and second sector cell centerpieces located on opposite sides of said center window, each having a pair of sector cell chambers and filling holes connected to said chambers, said housing including radial filling opening aligned with said filling holes and adapted to be closed by sealing plugs, said sector cell chambers being arranged for series transmission of light through respective chambers in said first and second centerpieces.
Claim 3
Dependent Claim
18 words
An analytical cell as specified in claim 1 wherein said upper, lower and center windows have equal thickness.
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) | 1981-05-22 | 1981-11-21 | 1982-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-22 | 1985-11-21 | 1986-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-22 | 1989-11-21 | 1990-05-23 | $7700.00 | Window Closed / Lapsed |