US3584685A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tubular screen
Assignee: SIGNAL ENVIRONMENTAL SYSTEMS Inc A CORP OF
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Filing: 1968-12-30
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Granted: 1971-06-15
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Expires: 1988-12-30
Abstract
Abstract A tubular screen means formed by the helical winding and attachment of a continuous rod member around a plurality of spaced longitudinal bar members in a manner sufficient to provide a continuous helical slot opening of continuously increasing slot width.
Inventors
- 👤 David M Boyd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:49
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/02; E21B43/08; E21B43/088; B; B01; B01D; B01D29/00; B01D29/11; B01D29/111; B01D29/13; B01D29/15; B01D29/44; B01D29/48
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
42 words
A tubular screen means formed by the helical winding and attachment of a continuous rod member around a plurality of spaced longitudinal bar members in a manner sufficient to provide a continuous helical slot opening of continuously and unidirectionally varying slot width.
Claim 2
Dependent Claim
42 words
A tubular screen means formed by the helical winding and attachment of a continuous rod member around a plurality of spaced longitudinal bar members in a manner sufficient to provide a continuous helical slot opening of continuously and unidirectionally varying slot width.
Claim 3
Dependent Claim
46 words
Screen means of claim 1 wherein said continuous rod member is of wedge-shaped cross section with the wider portion thereof along the outer screen surface resulting in a helical slot opening having a wedge-shaped cross section with the wider portion thereof along the inner screen surface.
Claim 4
Dependent Claim
15 words
Screen means of claim 2 wherein said continuous rod member has a channel-shaped cross section.
Claim 5
Dependent Claim
46 words
Screen means of claim 1 wherein said continuous rod member is of wedge-shaped cross section with the wider portion thereof along the inner screen surface resulting in a helical slot opening having a wedge-shaped cross section with the wider portion thereof along the outer screen surface.
Claim 6
Dependent Claim
15 words
Screen means of claim 4 wherein said continuous rod member has a channel-shaped cross section.
References Cited (Backward Citations)
US765182A
Cited
US2084433A
Cited
US2046458A
Cited
US2346647A
Cited
US2582340A
Cited
US2682309A
Cited
US3483992A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-14 | 1974-12-14 | 1975-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-14 | 1978-12-14 | 1979-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-14 | 1982-12-14 | 1983-06-15 | $7700.00 | Window Closed / Lapsed |