Patent US2839505A successfully refreshed from Google Patents.
US2839505A
Expired / Lapsed
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Polymers of o-p-toluyl-benzoic acids
Assignee: Sprague Electric Co
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Filing: 1955-02-04
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Granted: 1958-06-17
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Expires: 1975-02-04
Abstract
No abstract record available.
Inventors
- 👤 Sidney D Ross
- 👤 Schwarz Meyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:04
CPC Classifications
C; C08; C08G; C08G61/00; C08G61/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
A PROCESS FOR POLYMERIZING AN O-P-TOLUYL BENZOIC ACID WHICH COMPRISES HEATING SAID ACID IN THE PRESENCE OF A STRONG DEHYDRATING ACID AT A TEMPERATURE IN THE RANGE OF FROM ABOUT 50*C. TO A REFLUXING TEMPERATURE OF THE GROUP CONSISTING OF POLYPHOSPHORIC ACID AND ANHYDRIDES OF PERFLUORINATED ALIPHATIC ACIDS, AND SEPARATING THE POLYMERIZED PRODUCT FROM THE REACTION MIXTURE.
Claim 2
Dependent Claim
57 words
A PROCESS FOR POLYMERIZING AN O-P-TOLUYL BENZOIC ACID WHICH COMPRISES HEATING SAID ACID IN THE PRESENCE OF A STRONG DEHYDRATING ACID AT A TEMPERATURE IN THE RANGE OF FROM ABOUT 50*C. TO A REFLUXING TEMPERATURE OF THE GROUP CONSISTING OF POLYPHOSPHORIC ACID AND ANHYDRIDES OF PERFLUORINATED ALIPHATIC ACIDS, AND SEPARATING THE POLYMERIZED PRODUCT FROM THE REACTION MIXTURE.
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) | 1961-06-16 | 1961-12-16 | 1962-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-16 | 1965-12-16 | 1966-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-16 | 1969-12-16 | 1970-06-17 | $7700.00 | Window Closed / Lapsed |