Patent US5021095A successfully refreshed from Google Patents.
US5021095A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for removing asbestos and the device for removing the same
Assignee: HOKKAIDO PIPELINE INDUSTRIAL Co Ltd A CORP OF JAPAN
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Filing: 1989-01-25
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Granted: 1991-06-04
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Expires: 2009-01-25
Abstract
Abstract A process and device for removing a sprayed asbestos layer are provided, in which the asbestos is simultaneously cut and suctioned by a scraper and a suction air duct, and then transported into a carrier container for collection through primary, secondary and tertiary collection steps, in order to maintain a safe and sanitary operational environment for those who are engaged in removing the asbestos layer.
Inventors
- 👤 Masaru Tamaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:02
CPC Classifications
B; B08; B08B; B08B15/00; B08B15/02; B08B15/026
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
102 words
A process for removing a sprayed asbestos layer from a surface, comprising: simultaneously cutting and suctioning asbestos by a scraper and a suction air duct; directing the thus-suctioned asbestos into a collector through a closed conduit to collect asbestos dust within water as a primary collecting step; carrying out a secondary collecting step in a wet cyclone by showering, in said cyclone, air that has passed through said collector to effect separation of asbestos out of said air; and then carrying out a tertiary collecting step to treat, with a scrubber and a compound filter, air that has passed through said cyclone.
Claim 2
Dependent Claim
102 words
A process for removing a sprayed asbestos layer from a surface, comprising: simultaneously cutting and suctioning asbestos by a scraper and a suction air duct; directing the thus-suctioned asbestos into a collector through a closed conduit to collect asbestos dust within water as a primary collecting step; carrying out a secondary collecting step in a wet cyclone by showering, in said cyclone, air that has passed through said collector to effect separation of asbestos out of said air; and then carrying out a tertiary collecting step to treat, with a scrubber and a compound filter, air that has passed through said cyclone.
Claim 3
Independent Claim
86 words
A device for removing a sprayed asbestos layer comprising: an attachment comprising a scraper integrally formed with a suction air duct which is provided with a plurality of apertures perforated therein and with a suction inlet, a closed conduit connected to said air duct through a hose, for carrying asbestos dust thus suctioned, a collector, said collector connected to a wet cyclone, and said wet cyclone connected to a scrubber within said closed conduit, and a compound filter disposed at an end of said closed conduit.
Claim 4
Independent Claim
86 words
A device for removing a sprayed asbestos layer comprising: an attachment comprising a scraper integrally formed with a suction air duct which is provided with a plurality of apertures perforated therein and with a suction inlet, a closed conduit connected to said air duct through a hose, for carrying asbestos dust thus suctioned, a collector, said collector connected to a wet cyclone, and said wet cyclone connected to a scrubber within said closed conduit, and a compound filter disposed at an end of said closed conduit.
Claim 5
Dependent Claim
22 words
The device of claim 2, wherein said scraper is upwardly bent at an upper end thereof so as to provided scraping means.
Claim 6
Dependent Claim
32 words
The device of claim 2 wherein said suction air duct is provided with said plurality of apertures at a prescribed position in a vicinity of said suction inlet of said air duct.
Claim 7
Dependent Claim
26 words
The device of claim 2 wherein said suction air duct is provided with a raised portion formed at an upper end thereof to collect scattering asbestos.
Claim 8
Dependent Claim
16 words
The device of claim 2 wherein a rotary electric brush is provided inside said suction inlet.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-06-03 | 1994-12-03 | 1995-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-06-03 | 1998-12-03 | 1999-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-06-03 | 2002-12-03 | 2003-06-04 | $7700.00 | Window Closed / Lapsed |