US4966759A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid purification
Assignee: 1025130 ONTARIO Ltd
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Filing: 1989-09-07
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Granted: 1990-10-30
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Expires: 2009-09-07
Abstract
Abstract A purifier for water or air removes, reduces or detoxifies organic pollutants therefrom by causing the fluid to contact a matrix having surfaces with which a fixed anatase (TiO 2 ) or other photoreactive metal semiconductor material is bonded, in the presence of light of a wavelength that will activate the material.
Inventors
- 👤 Michael K. Robertson
- 👤 Robert B. Henderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:48
CPC Classifications
A; A62; A62D; A62D3/00; A62D3/10; A62D3/17; A61; A61L; A61L9/00; A61L9/16; A61L9/18; B; B01; B01J; B01J19/00; B01J19/08; B01J19/12; B01J19/122; B01J19/123; C; C02; C02F; C02F1/00; C02F1/30; C02F1/32; C02F1/325; C03; C03C; C03C25/00; C03C25/10; C03C25/42; A62D2101/00; A62D2101/20; A62D2101/22; A62D2203/00; A62D2203/10; C02F2201/00; C02F2201/32; C02F2201/322; C02F2201/3223; C03C2217/00; C03C2217/70; C03C2217/71; Y; Y10; Y10S; Y10S422/00; Y10S422/905
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
73 words
A matrix for use in a method of removing, reducing or detoxifying organic pollutants from a fluid, comprising a substrate in the form of a plurality of layers of a filamentous, fibrous or stranded base material, and a photoreactive metal semiconductor material bonded with, to or into surfaces of said layers, at least one of said layers being at least partially transparent to light at a wavelength to which the semiconductor material photoreacts.
Claim 2
Dependent Claim
73 words
A matrix for use in a method of removing, reducing or detoxifying organic pollutants from a fluid, comprising a substrate in the form of a plurality of layers of a filamentous, fibrous or stranded base material, and a photoreactive metal semiconductor material bonded with, to or into surfaces of said layers, at least one of said layers being at least partially transparent to light at a wavelength to which the semiconductor material photoreacts.
Claim 3
Dependent Claim
45 words
A matrix as in claim 1, wherein said layer transparency is a result of at least one of (a) the base material being substantially transparent to light at said wavelength, and (b) the layer having a porous nature permitting the transmission of said light therethrough.
Claim 4
Dependent Claim
17 words
A matrix as in claim 2, wherein the base material is fiberglass and the layers are porous.
Claim 5
Dependent Claim
18 words
A matrix as in claim 1, wherein said layers are formed by convolutions of a cylindrical, multi-convolution sleeve.
Claim 6
Dependent Claim
24 words
A matrix as in claim 1, wherein said layers comprise at least two coaxial tubes of film or glass coated with said photoreactive material.
Claim 7
Dependent Claim
12 words
A matrix as in claim 5, wherein each said tube is imperforate.
Claim 8
Dependent Claim
12 words
A matrix as in claim 1, wherein the photoreactive material is anatase.
Claim 9
Dependent Claim
24 words
A matrix as in claim 1, wherein the photoreactive material is selected from Cds, CdSe, ZnO 2 , WO 3 and SnO 2 .
References Cited (Backward Citations)
US4892712A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1993-10-29 | 1994-04-30 | 1994-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-29 | 1998-04-30 | 1998-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-29 | 2002-04-30 | 2002-10-30 | $7700.00 | Window Closed / Lapsed |