US2554443A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Azo safranine leather dyestuffs
Assignee: GAF Chemicals Corp
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Filing: 1947-11-13
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Granted: 1951-05-22
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Expires: 1967-11-13
Abstract
No abstract record available.
Inventors
- 👤 John J Hayden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:37
CPC Classifications
D; D06; D06P; D06P3/00; D06P3/02; D06P3/04; D06P3/32; D06P3/324; C; C09; C09B; C09B29/00; C09B29/0025; C09B29/06; C09B29/08
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
19 words
A DYESTUFF SUITABLE FOR PRODUCING BRILLIANT DENSE REDDISH-BLACK SHADES ON LEATHER WITH OUTSTANDING PENETRATION THEREOF, HAVING THE FOLLOWING FORMULA:
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) | 1954-05-21 | 1954-11-20 | 1955-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-21 | 1958-11-20 | 1959-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-21 | 1962-11-20 | 1963-05-22 | $7700.00 | Window Closed / Lapsed |