Patent US1669493A successfully refreshed from Google Patents.
US3547899A
Expired / Lapsed
US
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Polymers containing sulphonic acid groups
Assignee: Bayer AG
•
Filing: 1969-07-23
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Granted: 1970-12-15
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Expires: 1989-07-23
Abstract
No abstract record available.
Inventors
- 👤 Dieter Arlt
- 👤 Dietrich Glabisch
- 👤 Carlhans Suling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:31
CPC Classifications
C; C08; C08F; C08F28/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA704373A
Cited
US2983712A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-12-14 | 1974-06-15 | 1974-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-14 | 1978-06-15 | 1978-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-14 | 1982-06-15 | 1982-12-15 | $7700.00 | Window Closed / Lapsed |