US3960722A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil adsorbent
Assignee: Idemitsu Kosan Co Ltd
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Filing: 1975-01-27
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Granted: 1976-06-01
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Expires: 1995-01-27
Abstract
Abstract An oil adsorbent comprising a plastic material for eliminating oils present in or on the surface of water through adsorption. Said adsorbent is produced by foaming by a physical means polyethylene containing 30-80% by weight of at least one inorganic calcium compound selected from the group consisting of calcium sulfite and calcium carbonate, to prepare a foamy substance having a density of 0.06-0.10 g/cc and then shaping the substance to have a network structure.
Inventors
- 👤 Masami Tomikawa
- 👤 Akiji Tsunoda
- 👤 Kazuhisa Kaneda
- 👤 Hideo Ohkawa
- 👤 Yutaka Mugino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:46
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0066; B; B01; B01J; B01J20/00; B01J20/22; C02; C02F; C02F1/00; C02F1/68; C02F1/681; C08J2323/00; C08J2323/02; C08J2323/04; Y; Y10; Y10S; Y10S264/00; Y10S264/17
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
67 words
A material for absorbing oil from oil-contaminated water comprising an openwork assembly of elongated strands in intimate contact, said strands having a diameter of about 1-5 mm and being formed of a flexible foam comprising a physically foamed mixture consisting essentially of about 20-70% of a non-crosslinked polyethylene resin and distributed uniformly through said resin about 80-30% of inorganic calcium compound particles, said percentages being by weight.
Claim 2
Dependent Claim
67 words
A material for absorbing oil from oil-contaminated water comprising an openwork assembly of elongated strands in intimate contact, said strands having a diameter of about 1-5 mm and being formed of a flexible foam comprising a physically foamed mixture consisting essentially of about 20-70% of a non-crosslinked polyethylene resin and distributed uniformly through said resin about 80-30% of inorganic calcium compound particles, said percentages being by weight.
Claim 3
Dependent Claim
15 words
The oil-absorbent material of claim 1 wherein said strand assembly is a substantially reticulated network.
Claim 4
Dependent Claim
19 words
The oil-absorbent material of claim 2 wherein the size of the mesh in said network is about 1-2 mm.
Claim 5
Dependent Claim
22 words
The oil-absorbent material of claim 1 wherein said calcium compound is at least one of calcium sulfite, calcium sulfate or calcium carbonate.
Claim 6
Dependent Claim
16 words
The oil-absorbent material of claim 1 wherein said foam has a density below about 0.10 g/cc.
Claim 7
Dependent Claim
22 words
A method of removing oil from oil-contaminated water comprising the step of contacting said water with the absorbent material of claim 1.
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) | 1979-06-01 | 1979-12-01 | 1980-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-01 | 1983-12-01 | 1984-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-01 | 1987-12-01 | 1988-06-01 | $7700.00 | Window Closed / Lapsed |