US3170912A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Azo dyestuffs containing a methylenesulfonylethanol radical or its sulfate ester
Assignee: GAF Chemicals Corp
•
Filing: 1961-12-28
•
Granted: 1965-02-23
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Expires: 1981-12-28
Abstract
No abstract record available.
Inventors
- 👤 Harlan B Freyermuth
- 👤 David I Randall
- 👤 Dolores M Buc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:29
CPC Classifications
C; C09; C09B; C09B62/00; C09B62/44; C09B62/503; C09B62/507; C09B62/51
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
6 words
AN AZO DYESTUFF OF THE FORMULA
Claim 2
Dependent Claim
6 words
AN AZO DYESTUFF OF THE FORMULA
References Cited (Backward Citations)
US2371536A
Cited
US2895785A
Cited
CA628971A
Cited
US2347143A
Cited
US2424493A
Cited
US2657205A
Cited
US2728762A
Cited
US2880117A
Cited
FR1181107A
Cited
US3094516A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-02-23 | 1968-08-24 | 1969-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-02-23 | 1972-08-24 | 1973-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-02-23 | 1976-08-24 | 1977-02-23 | $7700.00 | Window Closed / Lapsed |