US4084905A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for detecting and measuring fluorescence emission
Assignee: Simon Fraser University
•
Filing: 1976-03-11
•
Granted: 1978-04-18
•
Expires: 1996-03-11
Abstract
Abstract Apparatus for detecting and measuring fluorescence emission comprising a fluorometer probe including a light emitting means for illuminating the object under study, a red cut-off filter, a light sensitive detector for obtaining the fluorscence signal from the object, and a preamplifier connected to the phototransistor for amplifying the said signal to a first level, and power and control unit including electronic indicating means. In the preferred embodiment the sensor and emitter are a light emitting diode (LED) and a phototransistor arranged in piggy-back relation with the LED having an epoxy body acting as a fluorescence light guide from the object to the phototransistor.
Inventors
- 👤 Ulrich Schreiber
- 👤 William Vidaver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:56
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/62; G01N21/63; G01N21/64; G01N21/6486; G01N21/645; G01N2021/635; G01N2201/00; G01N2201/06; G01N2201/062
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
188 words
Apparatus for measuring light induced changes of chorophyll fluorescence yield i.e. the Kautsky effect in living plant samples comprising: (a) a fluorometer probe comprising: (1) a housing having a transparent window, (2) a light emitting diode mounted in an epoxy dome lens positioned inside the housing adjacent the said window for illuminating the plant sample through the window, (3) a phototransistor operating in the photovoltaic mode for detecting and measuring fluorescence emission received through the window from the plant sample on illumination mounted inside the housing in piggy-back relation to the said light emitting diode such that fluorescence emission from the plant sample passing through the window is collected and guided by the epoxy lens to the phototransistor, (4) an optical filter mounted between the window and the phototransistor, (5) a preamplifier adjacent and connected to the phototransistor, (b) timing and control means connected to the probe via an extended electrical lead cable comprising: (1) a timing circuit connected to the light emitting diode for controlling its on-off times, (2) an amplifier and electrical filter connected to the preamplifier, (c) output recording means connected to the said amplifier.
Claim 2
Dependent Claim
188 words
Apparatus for measuring light induced changes of chorophyll fluorescence yield i.e. the Kautsky effect in living plant samples comprising: (a) a fluorometer probe comprising: (1) a housing having a transparent window, (2) a light emitting diode mounted in an epoxy dome lens positioned inside the housing adjacent the said window for illuminating the plant sample through the window, (3) a phototransistor operating in the photovoltaic mode for detecting and measuring fluorescence emission received through the window from the plant sample on illumination mounted inside the housing in piggy-back relation to the said light emitting diode such that fluorescence emission from the plant sample passing through the window is collected and guided by the epoxy lens to the phototransistor, (4) an optical filter mounted between the window and the phototransistor, (5) a preamplifier adjacent and connected to the phototransistor, (b) timing and control means connected to the probe via an extended electrical lead cable comprising: (1) a timing circuit connected to the light emitting diode for controlling its on-off times, (2) an amplifier and electrical filter connected to the preamplifier, (c) output recording means connected to the said amplifier.
References Cited (Backward Citations)
US3811777A
Cited
US3910701A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-04-17 | 1981-10-17 | 1982-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-17 | 1985-10-17 | 1986-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-17 | 1989-10-17 | 1990-04-18 | $7700.00 | Window Closed / Lapsed |