Patent US4292042A successfully refreshed from Google Patents.
US4292042A
Expired / Lapsed
US
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Analysis of vinyl acetate
Assignee: Union Carbide Corp
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Filing: 1980-05-14
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Granted: 1981-09-29
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Expires: 2000-05-14
Abstract
Abstract Vinyl acetate in ambient air is measured by first drying the air sample, then adsorbing the vinyl acetate on an adsorbent containing a polymerization inhibitor, followed by desorption and assay of the desorbed vinyl acetate.
Inventors
- 👤 Howard J. Kimble
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:19
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/0004; G01N33/0009; G01N33/0027; G01N33/0036; G01N33/0047; G01N30/00; Y; Y10; Y10T; Y10T436/00; Y10T436/20; Y10T436/200833; Y10T436/25; Y10T436/25125
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
121 words
A method of measuring the amount of vinyl acetate monomer in an ambient air atmosphere which comprises the series of steps of: (A) contacting a measured volume of ambient air containing vinyl acetate monomer vapor with drying means thereby freeing said measured volume of ambient air of water vapor; (B) contacting the said water vapor-freed measured volume of ambient air with vinyl acetate adsorbing means, said adsorbing means containing an inhibitor for vinyl acetate polymerizaton thereby separating the vinyl acetate monomer in the measured volume of ambient air from said ambient air; (C) desorbing the adsorbed vinyl acetate monomer from said vinyl acetate adsorbing means; and (D) measuring the amount of desorbed vinyl acetate with analytical means for assaying vinyl acetate.
Claim 2
Independent Claim
121 words
A method of measuring the amount of vinyl acetate monomer in an ambient air atmosphere which comprises the series of steps of: (A) contacting a measured volume of ambient air containing vinyl acetate monomer vapor with drying means thereby freeing said measured volume of ambient air of water vapor; (B) contacting the said water vapor-freed measured volume of ambient air with vinyl acetate adsorbing means, said adsorbing means containing an inhibitor for vinyl acetate polymerizaton thereby separating the vinyl acetate monomer in the measured volume of ambient air from said ambient air; (C) desorbing the adsorbed vinyl acetate monomer from said vinyl acetate adsorbing means; and (D) measuring the amount of desorbed vinyl acetate with analytical means for assaying vinyl acetate.
Claim 3
Dependent Claim
13 words
Method claimed in claim 1 wherein the drying means is anhydrous calcium sulfate.
Claim 4
Dependent Claim
18 words
Method claimed in claim 1 wherein the drying means is a crystalline zeolite of the molecular sieve type.
Claim 5
Dependent Claim
12 words
Method claimed in claim 1 wherein the adsorbing means is activated carbon.
Claim 6
Dependent Claim
13 words
Method claimed in claim 1 wherein the adsorbing means is bead activated carbon.
Claim 7
Dependent Claim
11 words
Method claimed in claim 1 wherein the polymerization inhibitor is hydroquinone.
Claim 8
Dependent Claim
54 words
Method claimed in claim 1 wherein the vinyl acetate monomer containing ambient air atmosphere is contacted with the drying means and adsorbing means at a rate of about 15 to about 90 liters of air per 2 grams of drying agent and per 150 mg. of adsorbent at a flow rate of 50-1000 cc/min.
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) | 1984-09-28 | 1985-03-30 | 1985-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-28 | 1989-03-30 | 1989-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-28 | 1993-03-30 | 1993-09-29 | $7700.00 | Window Closed / Lapsed |