US2565147A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for hydrolyzing copolymers of maleic acid derivatives
Assignee: QUAKER CHEMICAL PRODUCTS Corp
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Filing: 1948-12-22
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Granted: 1951-08-21
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Expires: 1968-12-22
Abstract
No abstract record available.
Inventors
- 👤 Helmuth L Pfluger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:47
CPC Classifications
C; C08; C08F; C08F8/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
24 words
THE PROCESS WHICH COMPRISES POLYMERIZING (1) A COMPOUND SELECTED FROM THE GROUP CONSISTING OF MALEIC ANHYDRIDE AND A MALEIC ACID DERIVATIVE OF THE FORMULA
Claim 2
Dependent Claim
24 words
THE PROCESS WHICH COMPRISES POLYMERIZING (1) A COMPOUND SELECTED FROM THE GROUP CONSISTING OF MALEIC ANHYDRIDE AND A MALEIC ACID DERIVATIVE OF THE FORMULA
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-08-20 | 1955-02-19 | 1955-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-08-20 | 1959-02-19 | 1959-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-08-20 | 1963-02-19 | 1963-08-21 | $7700.00 | Window Closed / Lapsed |