Patent US2853481A successfully refreshed from Google Patents.
US2853481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Azo dyestuffs
Assignee: GAF Chemicals Corp
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Filing: 1954-12-30
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Granted: 1958-09-23
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Expires: 1974-12-30
Abstract
No abstract record available.
Inventors
- 👤 Albert F Strobel
- 👤 William W Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:37
CPC Classifications
C; C09; C09B; C09B45/00; C09B45/02; C09B45/14; C09B45/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
19 words
A DYESTUFF SELECTED FROM THE GROUP CONSISTING OF COMPOUNDS DEVOID OF CARBOXYLIC AND SULFONIC ACID GROUPS HAVING THE FROMULA
Claim 2
Dependent Claim
19 words
A DYESTUFF SELECTED FROM THE GROUP CONSISTING OF COMPOUNDS DEVOID OF CARBOXYLIC AND SULFONIC ACID GROUPS HAVING THE FROMULA
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) | 1961-09-22 | 1962-03-24 | 1962-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-22 | 1966-03-24 | 1966-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-22 | 1970-03-24 | 1970-09-23 | $7700.00 | Window Closed / Lapsed |