Patent US4448530A successfully refreshed from Google Patents.
US4448530A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spectrophotometer
Assignee: PE Manufacturing GmbH
•
Filing: 1981-02-23
•
Granted: 1984-05-15
•
Expires: 2001-02-23
Abstract
Abstract A spectrophotometer producing a derivative spectrum of a looked-for component of a sample includes means for producing an output signal which is directly representative of the concentration of the looked-for element.
Inventors
- 👤 Albert Schmitt, deceased
- 👤 heir by Magdalena S. Schmitt
- 👤 heir by Thomas Schmitt
- 👤 heir by Martin Schmitt
- 👤 heir by Georg Schmitt
- 👤 heir by Annette Schmitt
- 👤 Ernst Spreitzhofer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:46
CPC Classifications
G; G01; G01J; G01J3/00; G01J3/28; G01J3/42; G01J3/433
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
155 words
Spectrophotometer for determining the concentration of a looked-for component from a derivative spectrum; comprising: a monochromator having a wave length drive for scanning a wave length range; means for producing a derivative spectrum; a detector arrangement for producing a signal, which provides said derivative spectrum as a function of the wave length defined by said wave length drive; means for defining two wave length values; memory means for storing signals of said detector arrangement; applying means controlled by said wave length drive for applying said signals provided by said detector arrangement at the two defined wave lengths to said memory means; means for forming the difference of said two stored signals as measure of the concentration of said looked-for component in a sample; means for defining a calibration factor; and multiplying means for multiplying said difference by said calibration factor for producing a signal directly representing the concentration of said looked-for component in said sample.
Claim 2
Dependent Claim
155 words
Spectrophotometer for determining the concentration of a looked-for component from a derivative spectrum; comprising: a monochromator having a wave length drive for scanning a wave length range; means for producing a derivative spectrum; a detector arrangement for producing a signal, which provides said derivative spectrum as a function of the wave length defined by said wave length drive; means for defining two wave length values; memory means for storing signals of said detector arrangement; applying means controlled by said wave length drive for applying said signals provided by said detector arrangement at the two defined wave lengths to said memory means; means for forming the difference of said two stored signals as measure of the concentration of said looked-for component in a sample; means for defining a calibration factor; and multiplying means for multiplying said difference by said calibration factor for producing a signal directly representing the concentration of said looked-for component in said sample.
Claim 3
Dependent Claim
60 words
Spectrophotometer as claimed in claim 1, wherein said means for defining said calibration factor includes: means for entering the known concentration value of a standard; means for dividing said entered concentration value by the difference obtained with the standard, of the stored signals of said detector arrangement; and means for storing said quotient as said calibration factor for subsequent measurements.
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) | 1987-05-15 | 1987-11-14 | 1988-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-15 | 1991-11-14 | 1992-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-15 | 1995-11-14 | 1996-05-15 | $7700.00 | Window Closed / Lapsed |