Patent JPS4941111A successfully refreshed from Google Patents.
Patent US2911389A successfully refreshed from Google Patents.
US2911389A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resins formed from bis-(hydroxymethyl)-phosphinic acid and a poly-carboxylic acid
Assignee: Occidental Chemical Corp
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Filing: 1953-09-21
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Granted: 1959-11-03
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Expires: 1973-09-21
Abstract
No abstract record available.
Inventors
- 👤 Pernert John Carl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:07
CPC Classifications
C; C08; C08G; C08G79/00; C08G79/02; C08G79/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
37 words
THE PROCESS FOR PREPARING ACIDIC RESINS WHICH COMPRISES: HEATING, AT A TEMPERATURE ABOVE ABOUT FIFTY DEGREES CENTIGRADE, BIS-HYDROXYMETHYL PHOSPHINIC ACID AND AN ORGANIC ACID CONTAINING AT LEAST TWO CARBOXYL GROUPS, AND REMOVING WATER FROM THE RESULTING MIXTURE.
Claim 2
Dependent Claim
37 words
THE PROCESS FOR PREPARING ACIDIC RESINS WHICH COMPRISES: HEATING, AT A TEMPERATURE ABOVE ABOUT FIFTY DEGREES CENTIGRADE, BIS-HYDROXYMETHYL PHOSPHINIC ACID AND AN ORGANIC ACID CONTAINING AT LEAST TWO CARBOXYL GROUPS, AND REMOVING WATER FROM THE RESULTING MIXTURE.
References Cited (Backward Citations)
US2768997A
Cited
US2646420A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-11-02 | 1963-05-04 | 1963-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-02 | 1967-05-04 | 1967-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-02 | 1971-05-04 | 1971-11-03 | $7700.00 | Window Closed / Lapsed |