Patent US6175154B1 successfully refreshed from Google Patents.
US2857409A
Expired / Lapsed
US
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Polycarboxylates
Assignee: Monsanto Chemicals Ltd
•
Filing: 1953-01-19
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Granted: 1958-10-21
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Expires: 1973-01-19
Abstract
No abstract record available.
Inventors
- 👤 Dazzi Joachim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:42
CPC Classifications
C; C07; C07C; C07C69/00; C07C69/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
4 words
POLYCARBOXYLATES HAVING THE FORMULA
Claim 2
Dependent Claim
4 words
POLYCARBOXYLATES HAVING THE FORMULA
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-20 | 1962-04-21 | 1962-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-20 | 1966-04-21 | 1966-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-20 | 1970-04-21 | 1970-10-21 | $7700.00 | Window Closed / Lapsed |