US3715838A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for correcting misprinted matter on sheet material
Assignee: BTR Industries Ltd
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Filing: 1971-03-02
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Granted: 1973-02-13
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Expires: 1991-03-02
Abstract
Abstract Apparatus for correcting misprinted matter on sheet material, the means for directing a stream of finely divided particulate abrasive or granular material on the sheet material and means for collecting the spent material immediately after use, in which the projection may take place within an enclosure which is positioned over the sheet material and to which a suction air flow is connected to remove the abrasive material after use.
Inventors
- 👤 G Young
- 👤 H Silman
- 👤 E Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:48
CPC Classifications
B; B41; B41J; B41J29/00; B41J29/26; B43; B43L; B43L19/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
290 words
An apparatus for correcting misprinted matter on sheet material, comprising means for directing a stream of finely divided particulate abrasive material entrained within a stream of air onto the sheet material, and means for collecting spent material resulting from impingement of said abrasive material against said sheet material, an enclosure positionable over said sheet material within which said stream of particulate abrasive material is projected, and means including a source of suction air flow connected to said enclosure; said means for directing said abrasive material comprising a storage hopper for said abrasive material, closure means for said hopper comprising a porous plate at its lower end and a filler closure at its upper end, a chamber below the porous plate and means connecting said chamber to a source of air under pressure, air operated valve means mounted across the hopper just above the porous plate and comprising a first cylinder connected at one end to a second cylinder, a piston in said second cylinder and having a piston rod coaxiAl of the first cylinder, said rod having a projecting end extending into said first cylinder, a coaxial bore in said first cylinder opposite to said second cylinder, said bore being engageable by the projecting end of the piston rod to close said valve means, a radial bore in the first cylinder for the passage of abrasive material from the hopper to the first cylinder, a channel for the passage of air from the first cylinder to the hopper above the level of the abrasive material therein, duct means associated with said second cylinder to supply air pressure thereto to open and close said valve means, and a nozzle connected by channel means to the coaxial bore in the first cylinder.
Claim 2
Independent Claim
290 words
An apparatus for correcting misprinted matter on sheet material, comprising means for directing a stream of finely divided particulate abrasive material entrained within a stream of air onto the sheet material, and means for collecting spent material resulting from impingement of said abrasive material against said sheet material, an enclosure positionable over said sheet material within which said stream of particulate abrasive material is projected, and means including a source of suction air flow connected to said enclosure; said means for directing said abrasive material comprising a storage hopper for said abrasive material, closure means for said hopper comprising a porous plate at its lower end and a filler closure at its upper end, a chamber below the porous plate and means connecting said chamber to a source of air under pressure, air operated valve means mounted across the hopper just above the porous plate and comprising a first cylinder connected at one end to a second cylinder, a piston in said second cylinder and having a piston rod coaxiAl of the first cylinder, said rod having a projecting end extending into said first cylinder, a coaxial bore in said first cylinder opposite to said second cylinder, said bore being engageable by the projecting end of the piston rod to close said valve means, a radial bore in the first cylinder for the passage of abrasive material from the hopper to the first cylinder, a channel for the passage of air from the first cylinder to the hopper above the level of the abrasive material therein, duct means associated with said second cylinder to supply air pressure thereto to open and close said valve means, and a nozzle connected by channel means to the coaxial bore in the first cylinder.
Claim 3
Dependent Claim
49 words
An apparatus as claimed in claim 1, which further includes channel means connected to a source of air pressure passing through the storage hopper above the porous plate, and a restrictor orifice coaxially inside said channel means, and a nozzle connected to the outlet end of the channel means.
Claim 4
Dependent Claim
41 words
Apparatus as claimed in claim 2, said enclosure within which said nozzle is mounted having a wall with an aperture therein for the passage of the stream of abrasive material therethrough onto sheet material positioned adjacent said aperture of the enclosure.
Claim 5
Dependent Claim
24 words
An apparatus as claimed in claim 3, in which an air pervious ring is positioned around the aperture in the wall of the enclosure.
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) | 1976-02-13 | 1976-08-14 | 1977-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-13 | 1980-08-14 | 1981-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-13 | 1984-08-14 | 1985-02-13 | $7700.00 | Window Closed / Lapsed |