Patent US3170912A successfully refreshed from Google Patents.
US3170912A
Expired / Lapsed
US
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Azo dyestuffs containing a methylenesulfonylethanol radical or its sulfate ester
Assignee: GAF Chemicals Corp
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Filing: 1961-12-28
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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 16:04
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
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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 |