Patent US4393303A successfully refreshed from Google Patents.
Patent US5227172A successfully refreshed from Google Patents.
US5227172A
Expired / Lapsed
US
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Charged collector apparatus for the production of meltblown electrets
Assignee: ExxonMobil Chemical Patents Inc
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Filing: 1991-05-14
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Granted: 1993-07-13
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Expires: 2011-05-14
Abstract
Abstract The apparatus of the present invention employs a collector drum with an electrically charged surface for use in preparing electrically charged meltblown fibrous webs. The apparatus may be used as a primary charging system or, alternatively, with other charging system to enhance the charging of the web. The invention produces webs with exceptional filtration properties.
Inventors
- 👤 William E. Deeds
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:22
CPC Classifications
B; B29; B29C; B29C41/00; B29C41/24; B29C41/26; B29C48/00; B29C48/03; B29C48/05; B29C48/07; B29C48/08; B29C48/25; B29C48/30; B29C48/345; B29C48/88; B29C48/911; B29C48/9135; B29C48/914; B29C48/915; B29C48/9165; B29C41/02; B29C41/08; B29K; B29K2995/00; B29K2995/0003; B29L; B29L2007/00; B29L2007/008
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
110 words
A meltblowing apparatus for electrically charging webs produced thereby which comprises (a) a meltblowing die for discharging a row of thermoplastic molten fibers therefrom and having air chambers formed therein; (b) means for discharging air from the air chambers onto each side of the row of fibers to contact the fibers and form an air-fiber stream; (c) a first charging means including at least one electrode mounted in an air chamber for applying a charge to the air in that air chamber prior to contacting the fibers; (d) a rotating collector drum for collecting the fibers; and (e) a second charging means mounted on the drum for charging the fibers.
Claim 2
Dependent Claim
110 words
A meltblowing apparatus for electrically charging webs produced thereby which comprises (a) a meltblowing die for discharging a row of thermoplastic molten fibers therefrom and having air chambers formed therein; (b) means for discharging air from the air chambers onto each side of the row of fibers to contact the fibers and form an air-fiber stream; (c) a first charging means including at least one electrode mounted in an air chamber for applying a charge to the air in that air chamber prior to contacting the fibers; (d) a rotating collector drum for collecting the fibers; and (e) a second charging means mounted on the drum for charging the fibers.
Claim 3
Dependent Claim
32 words
The apparatus of claim 1 wherein the first charging means comprises two high voltage electrodes, one positioned in each air chamber for charging and ionizing the air prior to contacting the fibers.
Claim 4
Dependent Claim
28 words
The apparatus of claim 2 wherein the high voltage electrodes have positive polarity, and the second charging means has a voltage ranging from -25 kV to +25 kV.
Claim 5
Dependent Claim
18 words
The apparatus of claim 1 wherein each charging means carries a charge of -25 kV to +25 kV.
Claim 6
Dependent Claim
29 words
The apparatus of claim 1 wherein the collector drum includes an electrically conductive surface and wherein the second charging means comprises a D.C. source electrically connected to the surface.
Claim 7
Dependent Claim
16 words
The apparatus of claim 1 wherein the first and second charging means are of opposite polarity.
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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) | 1996-07-12 | 1997-01-11 | 1997-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-07-12 | 2001-01-11 | 2001-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-07-12 | 2005-01-11 | 2005-07-13 | $7700.00 | Window Closed / Lapsed |