US3389172A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sulfonic acids of nu, nu-bis (phenylalkyl) diamines
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1967-01-30
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Granted: 1968-06-18
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Expires: 1987-01-30
Abstract
No abstract record available.
Inventors
- 👤 Burrows Harold George
- 👤 Duxbury Frederick Keith
- 👤 Ingham Philip Brierley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:50
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3075066A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-06-18 | 1971-12-18 | 1972-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-18 | 1975-12-18 | 1976-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-18 | 1979-12-18 | 1980-06-18 | $7700.00 | Window Closed / Lapsed |