US3855455A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signal analyzer
Assignee: Eastman Kodak Co
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Filing: 1973-01-18
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Granted: 1974-12-17
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Expires: 1993-01-18
Abstract
Abstract A fiber length analyzer is disclosed that detects the various lengths of fibers present in a liquid medium and converts data representing these fiber lengths into a distribution related to the range and relative number of different fiber lengths present in the medium.
Inventors
- 👤 H Allinger
- 👤 R Kelly
- 👤 G Gray
- 👤 R Indre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:20
CPC Classifications
G; G01; G01N; G01N15/00; G01N15/10; G01N15/1031; G01N15/12; G06; G06M; G06M11/00; G06M11/02; G06M11/04; G01N2015/0042; G01N2015/0053; G01N2015/0057
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
222 words
A signal analyzer for automatically generating data related to the distribution of lengths of fibers suspended in a liquid medium, said analyzer comprising: detector means comprising means adapted for immersion in said medium and having an orifice for detecting the passage of fibers therethrough and for generating a train of detector output pulses in accordance therewith, the duration of said pulses being proportional to the length and velocity of said detected fibers through said orifice, and to the thickness of said orifice; means responsive to said detector output pulses for determining the time duration of each pulse, each of said durations being representative of weighted mean fiber length, and said means comprising oscillator means for generating a signal of predetermined frequency, gating means for controlling the transmission of said predetermined frequency signal in accordance with the duration of said output pulses, counter means for counting the number of cycles in each of the output signals of said gating means, and means for converting the output of said counter means into corresponding digital coded signals; counter means responsive to said coded signals for counting the number of digital codes representing values within each of a plurality of value ranges; and means for converting the counts in said counting means into data representing a distribution of lengths of fibers suspended in said liquid medium.
Claim 2
Dependent Claim
222 words
A signal analyzer for automatically generating data related to the distribution of lengths of fibers suspended in a liquid medium, said analyzer comprising: detector means comprising means adapted for immersion in said medium and having an orifice for detecting the passage of fibers therethrough and for generating a train of detector output pulses in accordance therewith, the duration of said pulses being proportional to the length and velocity of said detected fibers through said orifice, and to the thickness of said orifice; means responsive to said detector output pulses for determining the time duration of each pulse, each of said durations being representative of weighted mean fiber length, and said means comprising oscillator means for generating a signal of predetermined frequency, gating means for controlling the transmission of said predetermined frequency signal in accordance with the duration of said output pulses, counter means for counting the number of cycles in each of the output signals of said gating means, and means for converting the output of said counter means into corresponding digital coded signals; counter means responsive to said coded signals for counting the number of digital codes representing values within each of a plurality of value ranges; and means for converting the counts in said counting means into data representing a distribution of lengths of fibers suspended in said liquid medium.
Claim 3
Dependent Claim
50 words
A signal analyzer according to claim 1 wherein said means responsive to said detector output pulses includes means for shaping said output pulses to a square waveshape of preselected amplitude, the duration of each square-shaped pulse being representative of the duration and the waveshape of the corresponding detector output pulse.
Claim 4
Dependent Claim
63 words
A signal analyzer according to claim 2 wherein said shaping means is adapted to respond to the leading and trailing edges of said detector output pulses to trigger at preselected levels thereof the leading and trailing edges, respectively, of said square-shaped pulses whereby the durations of sAid square-shaped pulses are caused to more closely represent actual times of fiber passage through said orifice.
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) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |