US3993443A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Noxious vapor suppression using glass microbubbles with a fluorosilane or polyfluorosiloxane film
Assignee: 3M Co
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Filing: 1974-06-25
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Granted: 1976-11-23
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Expires: 1994-06-25
Abstract
Abstract A liquid body of volatile inorganic chemical which reacts with water and evolves acidic vapor, such as liquid sulfur trioxide, is treated to suppress the evolution of said noxious vapors therefrom to the atmosphere by applying to the exposed surface of said liquid body a treating agent comprising glass microbubbles having on the surfaces thereof an adherent film resulting from the application to said surfaces of a fluoroaliphatic radical-containing material selected from the group consisting of fluorosilane or poly(fluorosiloxane).
Inventors
- 👤 Richard A. Guenthner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:38
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/16; Y; Y10; Y10S; Y10S422/00; Y10S422/90; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2995; Y10T428/2996
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
90 words
The method of suppressing the evolution of noxious acidic vapor into the atmosphere from a body of volatile, inorganic liquid chemical which reacts with water, which comprises applying to the surface of said liquid body of chemical a treating agent comprising glass microbubbles having on the surfaces thereof an adherent film resulting from the application to said surfaces of a fluoroaliphatic radical-containing material selected from the group consisting of fluorosilane or poly(fluorosiloxane), so as to reduce the rate of flow of said evolved vapor from said body of liquid chemical.
Claim 2
Independent Claim
90 words
The method of suppressing the evolution of noxious acidic vapor into the atmosphere from a body of volatile, inorganic liquid chemical which reacts with water, which comprises applying to the surface of said liquid body of chemical a treating agent comprising glass microbubbles having on the surfaces thereof an adherent film resulting from the application to said surfaces of a fluoroaliphatic radical-containing material selected from the group consisting of fluorosilane or poly(fluorosiloxane), so as to reduce the rate of flow of said evolved vapor from said body of liquid chemical.
Claim 3
Dependent Claim
14 words
The method of claim 1 wherein said treating agent further comprises a fluorinated liquid.
Claim 4
Dependent Claim
79 words
The method of claim 1, wherein said fluoroaliphatic radical-containing material is a fluorosilane of the formula ##STR6## where R f is a fluoroaliphatic radical, Y is a divalent linking group, b is zero or 1, R is C n H 2n or C m H 2m -8 where n is 2 to 12 and m is 6 to 12, R' is a hydrolyzable group or hydrocarbyl radical or R f (Y) b R--, and R" is a hydrolyzable group.
Claim 5
Dependent Claim
18 words
The method of claim 1, wherein said fluoroaliphatic radical-containing material is C.sub.8 F.sub.17 SO.sub.2 N(C.sub.2 H.sub.5)C.sub.3 H.sub.6 Si(OCH.sub.3).sub.3
Claim 6
Dependent Claim
50 words
The method of claim 1, wherein said fluoroaliphatic radical-containing material is a poly(fluorosiloxane) of the formula ##STR7## where R f , Y, R and b are as defined in claim 4, R'" is R f (Y) b R--, H--, --O--, or a hydrocarbyl radical, and r is 2 or greater.
Claim 7
Dependent Claim
23 words
The method of claim 1 wherein said fluoroaliphatic radical-containing material is a poly(fluorosiloxane) of the formula ##STR8## where r is 2 or greater.
Claim 8
Dependent Claim
13 words
The method according to claim 1 wherein said chemical is liquid sulfur trioxide.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-11-23 | 1980-05-24 | 1980-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-23 | 1984-05-24 | 1984-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-23 | 1988-05-24 | 1988-11-23 | $7700.00 | Window Closed / Lapsed |