US4183984A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil sorbent material made by opening cells of a closed cell foam
Assignee: Leucadia Inc
•
Filing: 1977-10-27
•
Granted: 1980-01-15
•
Expires: 1997-10-27
Abstract
Abstract Closed cells in a flexible foam structure and preferably a polyethylene foam sheet are opened, suitably by needle punching, to increase the oil sorbency of the pad. One embodiment uses needle punching which does not pass all the way through the sheet, thus blocking passage of oil therethrough. Another embodiment employs unpunched strips for prevention of migration of the oil or for buoyancy purposes.
Inventors
- 👤 Scott D. Browers
- 👤 Donald E. Wiegand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:18
CPC Classifications
B; B26; B26D; B26D3/00; B26D3/006; B01; B01D; B01D17/00; B01D17/02; B01D17/0202; B01J; B01J20/00; B01J20/22; B29; B29C; B29C44/00; B29C44/34; B29C44/56; B29C44/5627; B29C44/5663; C; C02; C02F; C02F1/00; C02F1/68; C02F1/681; C09; C09K; C09K3/00; C09K3/32; Y; Y10; Y10S; Y10S210/00; Y10S210/918; Y10S210/922; Y10S210/924; Y10S521/00; Y10S521/905; Y10T; Y10T428/00; Y10T428/24; Y10T428/24273
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
98 words
An oil sorbent material comprising: (a) a flexible closed cell foam structure having at least about 50 percent by weight void space and having opposed surfaces; (b) said flexible closed cell foam structure having from about 100 to about 700 cells per cross sectional square inch and a density of from about 1 to about 5 pcf; (c) said flexible closed cell foam structure having at least a predominate portion of the closed cells opened through at least one said surface by needle punching with from about 50 to about 1000 holes per square inch of surface dimension.
Claim 2
Dependent Claim
98 words
An oil sorbent material comprising: (a) a flexible closed cell foam structure having at least about 50 percent by weight void space and having opposed surfaces; (b) said flexible closed cell foam structure having from about 100 to about 700 cells per cross sectional square inch and a density of from about 1 to about 5 pcf; (c) said flexible closed cell foam structure having at least a predominate portion of the closed cells opened through at least one said surface by needle punching with from about 50 to about 1000 holes per square inch of surface dimension.
Claim 3
Dependent Claim
19 words
The oil sorbent of claim 1 further comprising said holes passing completely through said flexible closed cell foam structure.
Claim 4
Dependent Claim
22 words
The oil sorbent of claim 2 further comprising at least one strip region of said sheet which is unbroken on both surfaces.
Claim 5
Dependent Claim
23 words
The oil sorbent of claim 2 further comprising a peripheral region at least one quarter inch wide which is unbroken on both surfaces.
Claim 6
Dependent Claim
25 words
The oil sorbent of claim 1 wherein said surface is broken by from about 200 to about 500 holes per square inch of surface dimension.
Claim 7
Dependent Claim
19 words
The oil sorbent of claim 1 wherein said structure is at least about 90 percent by weight void space.
Claim 8
Dependent Claim
25 words
The oil sorbent of claim 1 wherein the foam structure is composed of a resin selected from the group consisting of polyolefins and polyolefin copolymers.
Claim 9
Dependent Claim
22 words
The oil sorbent of claim 1 wherein said foam structure has from about 100 to about 700 cells per cross-sectional square inch.
Claim 10
Dependent Claim
101 words
An oil sorbent material comprising: (a) a flexible closed cell polethylene foam sheet having at least about 50 percent by weight void space and having opposed surfaces; (b) said flexible closed cell polyethylene foam sheet having from about 100 to about 700 cells per cross sectional square inch and a density of from about 1 to about 5 pcf; (c) said flexible closed cell polyethylene foam sheet having at least a predominate portion of the closed cells opened through at least one said surface by needle punching with from about 50 to about 1000 holes per square inch of surface dimension.
Claim 11
Dependent Claim
101 words
An oil sorbent material comprising: (a) a flexible closed cell polethylene foam sheet having at least about 50 percent by weight void space and having opposed surfaces; (b) said flexible closed cell polyethylene foam sheet having from about 100 to about 700 cells per cross sectional square inch and a density of from about 1 to about 5 pcf; (c) said flexible closed cell polyethylene foam sheet having at least a predominate portion of the closed cells opened through at least one said surface by needle punching with from about 50 to about 1000 holes per square inch of surface dimension.
Claim 12
Dependent Claim
20 words
The oil sorbent of claim 9 further comprising said holes passing completely through said flexible closed cell polyethylene foam sheet.
Claim 13
Dependent Claim
22 words
The oil sorbent of claim 10 further comprising at least one strip region of said sheet which is unbroken on both surfaces.
Claim 14
Dependent Claim
23 words
The oil sorbent of claim 10 further comprising a peripheral region at least one quarter inch wide which is unbroken on both surfaces.
Claim 15
Dependent Claim
25 words
The oil sorbent of claim 9 wherein said surface is broken by from about 200 to about 500 holes per square inch of surface dimension.
Claim 16
Dependent Claim
19 words
The oil sorbent of claim 9 wherein said sheet is at least about 90 percent by weight void space.
Claim 17
Dependent Claim
101 words
An oil sorbent material comprising: (a) a flexible closed cell foam structure having at least about 50 percent by weight void space and having first and second opposed surfaces; (b) said flexible closed cell foam structure having from about 100 to about 700 cells per cross sectional square inch and a density of from about 1 to about 5 pcf; (c) said flexible closed cell foam structure having at least 50 to about 1000 holes per square inch of surface dimension penetrating said first surface and continuing through said second surface whereby a predominate portion of the closed cells are opened.
Claim 18
Dependent Claim
101 words
An oil sorbent material comprising: (a) a flexible closed cell foam structure having at least about 50 percent by weight void space and having first and second opposed surfaces; (b) said flexible closed cell foam structure having from about 100 to about 700 cells per cross sectional square inch and a density of from about 1 to about 5 pcf; (c) said flexible closed cell foam structure having at least 50 to about 1000 holes per square inch of surface dimension penetrating said first surface and continuing through said second surface whereby a predominate portion of the closed cells are opened.
References Cited (Backward Citations)
US3048537A
Cited
US3098832A
Cited
US3426902A
Cited
US3994759A
Cited
US3669275A
Cited
US3679540A
Cited
US3862963A
Cited
US3960722A
Cited
US4005169A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-01-14 | 1983-07-16 | 1984-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-14 | 1987-07-16 | 1988-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-14 | 1991-07-16 | 1992-01-15 | $7700.00 | Window Closed / Lapsed |