US3769073A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for protecting a substrate with an arylsulfonamidopyrazine intumescent agent
Assignee: Cities Service Co
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Filing: 1972-02-11
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Granted: 1973-10-30
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Expires: 1992-02-11
Abstract
Abstract Intumescent compositions of the invention comprise certain arylsulfonamidopyrazines, such as 2-sulfanilamidopyrazine, 2sulfanilamidobenzopyrazine, and derivatives thereof. The intumescent agents may be employed in conjuction with additives conventionally used in intumescent compositions. For use in protecting substrates from heat and fire, the intumescent compositions may be applied to the substrates in any suitable manner, such as by electrodeposition, spraying onto an adhesive substrate, or application of a coating composition comprising the intumescent agent.
Inventors
- 👤 S Roth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:04
CPC Classifications
C; C09; C09D; C09D5/00; C09D5/18; C09D5/185; Y; Y10; Y10S; Y10S428/00; Y10S428/92; Y10S428/921; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249987; Y10T428/24999; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
32 words
The process of claim 1 wherein Ar is a divalent aromatic residue derived from benzene or naphthalene or an alkyl, haloalkyl, alkoxy, haloalkoxy, halo, hydroxy, carboxy, amino, amido, or nitro derivative thereof.
Claim 2
Dependent Claim
18 words
The process of claim 1, wherein R'''' is a pyrazyl radical or an alkoxy or benzo derivative thereof.
Claim 3
Dependent Claim
11 words
The process of claim 1, wherein the intumescent agent is 2-sulfanilamidopyrazine.
Claim 4
Dependent Claim
11 words
The process of claim 1, wherein the intumescent agent is 2-sulfanilamidobenzopyrazine.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |