Patent US3979253A successfully refreshed from Google Patents.
US3979253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for dispersing glass fibers for the preparation of glass filter media
Assignee: United States Department of the Navy
•
Filing: 1976-02-05
•
Granted: 1976-09-07
•
Expires: 1996-02-05
Abstract
Abstract Beta Glass fibers are dispersed in a solution containing hydrochloric acid and a hydrophobic fumed silicon dioxide treated with a silane thereby forming a slurry which is subjected to a sonic probe whereafter other glass fibers are mixed into said slurry and the mixture is formed into a glass fiber filter.
Inventors
- 👤 Robert C. Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:13
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; B01D39/20; B01D39/2003; B01D39/2017; B01D39/2024; D; D21; D21F; D21F13/00; D21F13/02; D21H; D21H13/00; D21H13/36; D21H13/38; D21H13/40; D21H23/00; D21H23/02; D21H23/04; D21H23/06; D21H23/08; D21H23/10; D21H5/00; D21H5/12; D21H5/1254; B01D2239/00; B01D2239/04; B01D2239/0471; Y; Y10; Y10S; Y10S55/00; Y10S55/05
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
197 words
A method of making Beta fiber reinforced glass filter media which comprises: heat cleaning a batch of Beta Glass fibers to remove any starch type sizing from the surface thereof; mixing a small amount of a hydrophobic fumed silicon dioxide treated with a silane with a solution of hydrochloric acid; adding said surface cleaned Beta Glass fibers to said hydrochloric acid solution containing said hydrophobic fumed silicon dioxide treated with a silane thereby forming a slurry and conditioning said fibers so that they will be held apart thus preventing roping or tangling of said fibers; subjecting said slurry to a sonic probe for a period of about 6 minutes to disperse any clumps of Beta fibers into individual strands and to open the fibers to that they will become coated with said hydrophobic fumed silicon dioxide treated with a silane; adding other glass fibers to said slurry; mixing said added glass fibers with said Beta Glass fibers in said slurry; pouring said slurry mix into a hand sheet mold; permitting said solution to drain from said mold leaving behind said glass fiber mixture which forms a glass fiber filter, and then removing said filter from said mold.
Claim 2
Independent Claim
197 words
A method of making Beta fiber reinforced glass filter media which comprises: heat cleaning a batch of Beta Glass fibers to remove any starch type sizing from the surface thereof; mixing a small amount of a hydrophobic fumed silicon dioxide treated with a silane with a solution of hydrochloric acid; adding said surface cleaned Beta Glass fibers to said hydrochloric acid solution containing said hydrophobic fumed silicon dioxide treated with a silane thereby forming a slurry and conditioning said fibers so that they will be held apart thus preventing roping or tangling of said fibers; subjecting said slurry to a sonic probe for a period of about 6 minutes to disperse any clumps of Beta fibers into individual strands and to open the fibers to that they will become coated with said hydrophobic fumed silicon dioxide treated with a silane; adding other glass fibers to said slurry; mixing said added glass fibers with said Beta Glass fibers in said slurry; pouring said slurry mix into a hand sheet mold; permitting said solution to drain from said mold leaving behind said glass fiber mixture which forms a glass fiber filter, and then removing said filter from said mold.
Claim 3
Dependent Claim
29 words
A method as claimed in claim 1 in which, said Beta fibers are cleaned by a heat treatment of from about 325°C to about 375°C for about 16 hours.
Claim 4
Dependent Claim
20 words
A method as claimed in claim 2 in which, said hydrochloric acid concentration is from 2.5 to about 3.0 pH.
Claim 5
Dependent Claim
34 words
A method as claimed in claim 3 in which, said silicon dioxide treated with a silane is mixed with said acid in an amount of about 0.02 gm. for each 21/2 liters of acid.
Claim 6
Dependent Claim
38 words
A method as claimed in claim 1 in which, said other glass fibers are mixed with said Beta Glass fibers in said slurry for about 5 to about 6 minutes prior to pouring into said hand sheet mold.
Claim 7
Dependent Claim
62 words
A method as claimed in claim 1 in which, said glass filter media comprises a mix with the following ratio: ______________________________________
Hand Sheet
weight
1.625 gr.
______________________________________
Glass Fiber A Grade (2.1μ)
21.9% 0.356
Glass Fiber AAA Grade (0.6μ)
71.9% 1.168
Beta Glass Fiber 1/4" long (3 to 4μ)
3.1% 0.05
Beta Glass Fiber 1/2" long (3 to 4μ)
3.1% 0.05.
______________________________________
Claim 8
Dependent Claim
62 words
A method as claimed in claim 1 in which, said glass filter media comprised a mix with the following ratio: ______________________________________
Machine Run
weight
37.5 gr.
______________________________________
Glass Fiber A Grade (2.1μ)
21.9% 8.21
Glass Fiber AAA Grade (0.6μ)
71.9% 26.96
Beta Glass Fiber 1/4" long (3 to 4μ)
3.1% 1.16
Beta Glass Fiber 1/2" long (3 to 4μ)
3.1% 1.16.
______________________________________
References Cited (Backward Citations)
US2797163A
Cited
US3253978A
Cited
US3228825A
Cited
US3240663A
Cited
US3375155A
Cited
US3249491A
Cited
US3882135A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-09-07 | 1980-03-08 | 1980-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-07 | 1984-03-08 | 1984-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-07 | 1988-03-08 | 1988-09-07 | $7700.00 | Window Closed / Lapsed |