US5124856A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording device with unitary filter medium to trap organic and inorganic chemical pollutants
Assignee: HGST Netherlands BV
•
Filing: 1990-08-03
•
Granted: 1992-06-23
•
Expires: 2010-08-03
Abstract
Abstract A chemical filter assembly mounted in a breather opening in a housing for a magnetic storage device or other device to permit pressure equalization with the surrounding environment comprises at least one filter medium for removing particulate matter, and a unitary filter medium of a fabric of activated carbon fibers that is impregnated with a chemical that in combination with the carbon provides protection against both organic and inorganic gaseous or vapor pollutants, said fibers having a pore size small enough prevent significant penetration by aqueous solutions so that during impregnation the pores will not become clogged with the chemical.
Inventors
- 👤 Charles A. Brown
- 👤 Leo Volpe
- 👤 Herman R. Wendt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:58
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; B01D39/20; B01D39/2055; B01D39/2065; A; A62; A62D; A62D9/00; B01D46/00; B01D46/10; B01D53/00; B01D53/02; B01D2239/00; B01D2239/04; B01D2239/0464; B01D2239/06; B01D2239/0604; B01D2239/0613; B01D2239/0618; B01D2239/12; B01D2239/1216
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
114 words
In a magnetic recording storage device of the type enclosed by a housing means with a breather opening to permit pressure equalization with the surrounding environment, the combination with said housing means of a chemical filter assembly mounted in a path through which a fluid flows through said opening and comprising at least one filter medium for removing particulate pollutants from the fluid, and a unitary filter medium of fabric that contains activated carbon fibers having a pore size small enough to prevent significant penetration by aqueous solutions and is impregnated with a chemical that in combination with carbon in the carbon fibers provides protection against both organic and inorganic gaseous or vapor pollutants.
Claim 2
Dependent Claim
114 words
In a magnetic recording storage device of the type enclosed by a housing means with a breather opening to permit pressure equalization with the surrounding environment, the combination with said housing means of a chemical filter assembly mounted in a path through which a fluid flows through said opening and comprising at least one filter medium for removing particulate pollutants from the fluid, and a unitary filter medium of fabric that contains activated carbon fibers having a pore size small enough to prevent significant penetration by aqueous solutions and is impregnated with a chemical that in combination with carbon in the carbon fibers provides protection against both organic and inorganic gaseous or vapor pollutants.
Claim 3
Dependent Claim
35 words
The combination of claim 1, wherein the pore size diameter does not exceed 40 Angstroms so as to insure that said chemical will not clog the pores of the fibers when the fabric is impregnated.
Claim 4
Dependent Claim
18 words
The combination of claim 1, wherein the chemical in the filter assembly is a water soluble metal carbonate.
Claim 5
Dependent Claim
18 words
The combination of claim 1, wherein the chemical in the filter assembly is a water soluble metal bicarbonate.
Claim 6
Dependent Claim
24 words
The combination of claim 1, wherein the chemical in the filter assembly is a soluble metal salt of a monomeric or polymeric organic acid.
Claim 7
Dependent Claim
25 words
The combination of claim 1, wherein the chemical in the filter assembly is a soluble metal salt of an inorganic acid such as phosphoric acid.
Claim 8
Dependent Claim
29 words
The combination of claim 1, wherein the chemical in the filter assembly is sodium carbonate to trap corrosive acid gases, such as sulfur dioxide, hydrochloric acid or nitrogen oxides.
Claim 9
Dependent Claim
26 words
The combination of claim 1, wherein the chemical in the filter assembly is a transition metal sulfate to trap ammonia or a low molecular weight amine.
Claim 10
Dependent Claim
19 words
The combination of claim 1, wherein the chemical in the filter assembly is a lead salt to trap sulfides.
Claim 11
Dependent Claim
20 words
The combination of claim 1, wherein the chemical in the filter assembly is a polymeric amine to trap acidic gases.
Claim 12
Dependent Claim
16 words
The combination of claim 1, wherein the chemical in the filter assembly is a colloidal material.
Claim 13
Dependent Claim
110 words
A magnetic recording storage device of the type comprising a head/disk assembly contained within a housing means having a breather opening to permit pressure equalization between the interior of the housing means and the surrounding environment and further comprising a chemical filter assembly mounted in a path through which a fluid flows through said opening, wherein the improvement comprises a fabric containing activated carbon fibers located in the filter assembly and having a pore size small enough to prevent significant penetration by aqueous solutions of the fluid, said fibers being impregnated with a chemical that in combination with the carbon fabric traps both organic and inorganic gaseous or vapor pollutants.
Claim 14
Dependent Claim
110 words
A magnetic recording storage device of the type comprising a head/disk assembly contained within a housing means having a breather opening to permit pressure equalization between the interior of the housing means and the surrounding environment and further comprising a chemical filter assembly mounted in a path through which a fluid flows through said opening, wherein the improvement comprises a fabric containing activated carbon fibers located in the filter assembly and having a pore size small enough to prevent significant penetration by aqueous solutions of the fluid, said fibers being impregnated with a chemical that in combination with the carbon fabric traps both organic and inorganic gaseous or vapor pollutants.
Claim 15
Dependent Claim
20 words
The device of claim 12, wherein the filter assembly also includes at least one HEPA filter to trap particulate pollutants.
Claim 16
Dependent Claim
19 words
The device of claim 12, wherein the activated carbon fibers have a pore size diameter not exceeding 40 Angstroms.
References Cited (Backward Citations)
US4195549A
Cited
US3969268A
Cited
US4772455A
Cited
US4489356A
Cited
US4576929A
Cited
US4696742A
Cited
US4684510A
Cited
US4863499A
Cited
US4988903A
Cited
US5030260A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-06-23 | 1995-12-23 | 1996-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-23 | 1999-12-23 | 2000-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-23 | 2003-12-23 | 2004-06-23 | $7700.00 | Window Closed / Lapsed |