Patent US4641792A successfully refreshed from Google Patents.
US4641792A
Expired / Lapsed
US
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Fiber depither
Assignee: Process Evaluation and Development Corp
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Filing: 1984-10-22
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Granted: 1987-02-10
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Expires: 2004-10-22
Abstract
Abstract The fiber depither consists of an upper array of feeder blades and a lower array of fan blades. These blades remove more particulate while resulting in less fiber damage.
Inventors
- 👤 Eduardo J. Villavicencio
- 👤 Jorge E. Arana
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:35
CPC Classifications
D; D01; D01B; D01B1/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
150 words
An improved depithing device comprising an inlet to permit the flow of fiber into a circular chamber having a perforated wall structure, an outlet from said circular chamber, a rotor carrying an upper plurality of blades and a lower plurality of blades centered for rotation within said circular chamnber, means to rotate said rotor, and a chamber surrounding said circular chamber and adapted to receive material passing through the perforated wall of said circular chamber; the improvement comprising said rotor having a separated upper and a lower plurality of blades; the uppermost blades of said upper plurality of blades being feeder blades having an end surface area at least 2 times the end surface area of the remaining blades; and the lowermost blades of said lower plurality of blades being fan blades wherein the outer end of said blades have a ratio of height to width of at least 5.
Claim 2
Dependent Claim
150 words
An improved depithing device comprising an inlet to permit the flow of fiber into a circular chamber having a perforated wall structure, an outlet from said circular chamber, a rotor carrying an upper plurality of blades and a lower plurality of blades centered for rotation within said circular chamnber, means to rotate said rotor, and a chamber surrounding said circular chamber and adapted to receive material passing through the perforated wall of said circular chamber; the improvement comprising said rotor having a separated upper and a lower plurality of blades; the uppermost blades of said upper plurality of blades being feeder blades having an end surface area at least 2 times the end surface area of the remaining blades; and the lowermost blades of said lower plurality of blades being fan blades wherein the outer end of said blades have a ratio of height to width of at least 5.
Claim 3
Dependent Claim
21 words
An improved depithing device as in claim 1 wherein the surface of said circular chamber adjacent said feeder blades is continuous.
Claim 4
Dependent Claim
28 words
An improved depithing device as in claim 2 wherein said feeder blades comprise up to 1/3 of the total number of blades of said upper plurality of blades.
Claim 5
Dependent Claim
28 words
An improved depither device as in claim 3 wherein said fan blades comprise up to 1/3 of the total number of blades of said lower plurality of blades.
Claim 6
Dependent Claim
20 words
An improved depither device as in claim 1 wherein said circular chamber is comprised of a plurality of individual sections.
Claim 7
Dependent Claim
19 words
An improved depither device as in claim 5 wherein said circular chamber is comprised of at least four sections.
Claim 8
Dependent Claim
30 words
An improved depithing device as in claim 1 wherein there is a space between said upper plurality of blades and said lower plurality of blades of at least 12 cm.
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) | 1990-02-09 | 1990-08-11 | 1991-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-09 | 1994-08-11 | 1995-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-09 | 1998-08-11 | 1999-02-10 | $7700.00 | Window Closed / Lapsed |