Patent US2133635A successfully refreshed from Google Patents.
Patent US5342599A successfully refreshed from Google Patents.
US5342599A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface stabilized sources of isocyanic acid
Assignee: Noxtech Inc
•
Filing: 1990-12-11
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Granted: 1994-08-30
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Expires: 2010-12-11
Abstract
Abstract Composition, method and apparatus for providing a surface stabilized source of HNCO by adsorbing gaseous or liquid HNCO on the surface of a substrate. HNCO stabilized in this manner is not reactive and is stable at or above ambient temperature. The HNCO can be provided by heating a reactant source material, such as urea. The substrate can be heated to release HNCO. The present invention is especially useful as a source of HNCO for reducing NO x in gas streams.
Inventors
- 👤 Ralph J. Slone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:22
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/54; B01D53/56; F; F01; F01N; F01N2610/00; F01N2610/02
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
40 words
A method of storing HNCO in stable form comprising the steps of contacting a substrate with gaseous HNCO at a temperature above about 450° F., and maintaining the temperature above about 450° F. until HNCO is bonded to the substrate.
Claim 2
Independent Claim
40 words
A method of storing HNCO in stable form comprising the steps of contacting a substrate with gaseous HNCO at a temperature above about 450° F., and maintaining the temperature above about 450° F. until HNCO is bonded to the substrate.
Claim 3
Dependent Claim
13 words
The method of claim 1, wherein said substrate is an ion exchange resin.
Claim 4
Dependent Claim
12 words
The method of claim 1, wherein said substrate is a precious metal.
Claim 5
Dependent Claim
12 words
The method of claim 1, wherein said substrate is a molecular sieve.
Claim 6
Dependent Claim
11 words
The method of claim 1, wherein said substrate is a zeolite.
Claim 7
Dependent Claim
11 words
The method of claim 1, wherein said substrate is activated charcoal.
Claim 8
Dependent Claim
22 words
A method according to claim 1 and further including the step of cooling said HNCO after it has bonded to said substrate.
Claim 9
Independent Claim
45 words
A method of storing HNCO in stable form comprising the steps of contacting a substrate with liquid HNCO at a temperature below ambient temperature, and subsequently causing the temperature to move toward ambient temperature until a desired quantity of HNCO is bonded to the substrate.
Claim 10
Independent Claim
45 words
A method of storing HNCO in stable form comprising the steps of contacting a substrate with liquid HNCO at a temperature below ambient temperature, and subsequently causing the temperature to move toward ambient temperature until a desired quantity of HNCO is bonded to the substrate.
Claim 11
Dependent Claim
13 words
The method of claim 8, wherein said substrate is an ion exchange resin.
Claim 12
Dependent Claim
12 words
The method of claim 8, wherein said substrate is a precious metal.
Claim 13
Dependent Claim
12 words
The method of claim 8, wherein said substrate is a molecular sieve.
Claim 14
Dependent Claim
11 words
The method of claim 8, wherein said substrate is a zeolite.
Claim 15
Dependent Claim
12 words
The method of claim 8, wherein said substrate is a activated charcoal.
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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) | 1997-08-29 | 1998-02-28 | 1998-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-08-29 | 2002-02-28 | 2002-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-08-29 | 2006-02-28 | 2006-08-30 | $7700.00 | Window Closed / Lapsed |