US2647815A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkyl diformyl phenylenediamines
Assignee: GAF Chemicals Corp
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Filing: 1951-05-03
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Granted: 1953-08-04
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Expires: 1971-05-03
Abstract
No abstract record available.
Inventors
- 👤 Saul R Buc
- 👤 Samuel A Glickman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:29
CPC Classifications
D; D06; D06P; D06P1/00; D06P1/44; D06P1/64; D06P1/642; D06P1/649; D06P1/6495; D06P1/6497; D06P1/22; D06P1/28
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
23 words
A MIXTURE OF N,N''-DIETHYL, N,N''-DIFORMYLP-PHENYLENDIAMINE; N,N''-DIETHYL, N,N''-DIFORMYL-P-PHENYLENDDIAMINE; AND N-METHYL, N''ETHYL, N,N''-DIFORMLY-P-PHENYLENEDIAMINE; WHEREIN THE METHYL AND ETHYL GROUPS ARE IN THE RATIO OF 1:3.
References Cited (Backward Citations)
US1273901A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-03 | 1957-02-02 | 1957-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-03 | 1961-02-02 | 1961-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-03 | 1965-02-02 | 1965-08-04 | $7700.00 | Window Closed / Lapsed |