US3769078A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Article coated with aromatic sulfonamide intumescent agent
Assignee: Individual
•
Filing: 1971-12-23
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Granted: 1973-10-30
•
Expires: 1991-12-23
Abstract
Abstract Coated articles of the invention are substrates coated with intumescent compositions which comprise certain aromatic sulfonamides bearing a nuclear substituent which is linked to the aromatic ring through a nitrogen atom. Exemplary of the intumescent agents are p-aminobenzenesulfonamide, pacetamidobenzenesulfonamide, and the corresponding naphthalenesulfonamides.
Inventors
- 👤 S Roth
- 👤 J Green
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:51
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: 6
Claim 1
Independent Claim
32 words
The article 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
15 words
The article of claim 2 wherein Ar is a divalent aromatic residue derived from benzene.
Claim 3
Dependent Claim
9 words
The article of claim 1 wherein R is hydrogen.
Claim 4
Dependent Claim
18 words
The article of claim 1 wherein R is an aliphatic acyl radical containing one to five carbon atoms.
Claim 5
Dependent Claim
11 words
The article of claim 1 wherein the intumescent agent is p-aminobenzenesulfonamide.
Claim 6
Dependent Claim
11 words
The article of claim 1 wherein the intumescent agent is p-acetamidobenzenesulfonamide.
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 |