Patent US3055869A successfully refreshed from Google Patents.
US3055869A
Expired / Lapsed
US
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Process for preparing polyesters using free acids
Assignee: Eastman Kodak Co
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Filing: 1959-12-21
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Granted: 1962-09-25
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Expires: 1979-12-21
Abstract
No abstract record available.
Inventors
- 👤 Earl W Wilson
- 👤 James E Hutchins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:18
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/82; C08G63/83; C08G63/02; C08G63/12; C08G63/16; C08G63/20; C08G63/84; C08G63/85
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
160 words
A PROCESS FOR PREPARING NONFIBER-FORMING LINEAR POLYESTER HAVING A MAXIMUM FREE DICARBOXYLIC ACID CONCENTRATION OF 0.3 PERCENT BY WEIGHT AND HAVING A MOLECULAR WEIGHT RANGING FROM 800 TO 8,000 STARTING WITH A FREE DICARBOXYLIC ACID COMPRISING HEATING AT A TEMPERATURE OF AT LEAST 170*C. (A) A DICARBOXYLIC ACID CONSISTING ESSENTIALLY OF AN ALIPHATIC ACID HAVING FROM 4 TO 12 CARBON ATOMS AND (B) A DIHYDROXY COMPOUND CONTAINING FROM 2 TO 20 CARBON ATOMS CONSISITNG ESSENTIALLY OF AN ALIPHATIC GLYCON IN THE PRESENCE OF FROM 0.001 TO 5% BY WEIGHT BASED ON (A) AND (B) OF A CATALYST COMPOSITION SELECTED FROM THE GROUP CONSISITNG OF (A) BASIC ALUMINUM ACETATE AND SODIUM ACETATE, (B) BASIC ALUMINUM ACETATE AND LITHIUM ACETATE, (C) STANNOUS OXALATE AND LITHIUM ACETATE, (D) STANNOUS OXALATE AND SODIUM ACETATE, AND (E) DIBUTLY TIN OXIDE AND SOLDIUM ACETATE, THE PROPORTION OF THE SECOND CONSTITUENT IN EACH OF THE CATALYST COMPOSITIONS BEING FROM 25% TO 50% WEIGHT OF THE FIRST CONSTITUENT.
Claim 2
Dependent Claim
160 words
A PROCESS FOR PREPARING NONFIBER-FORMING LINEAR POLYESTER HAVING A MAXIMUM FREE DICARBOXYLIC ACID CONCENTRATION OF 0.3 PERCENT BY WEIGHT AND HAVING A MOLECULAR WEIGHT RANGING FROM 800 TO 8,000 STARTING WITH A FREE DICARBOXYLIC ACID COMPRISING HEATING AT A TEMPERATURE OF AT LEAST 170*C. (A) A DICARBOXYLIC ACID CONSISTING ESSENTIALLY OF AN ALIPHATIC ACID HAVING FROM 4 TO 12 CARBON ATOMS AND (B) A DIHYDROXY COMPOUND CONTAINING FROM 2 TO 20 CARBON ATOMS CONSISITNG ESSENTIALLY OF AN ALIPHATIC GLYCON IN THE PRESENCE OF FROM 0.001 TO 5% BY WEIGHT BASED ON (A) AND (B) OF A CATALYST COMPOSITION SELECTED FROM THE GROUP CONSISITNG OF (A) BASIC ALUMINUM ACETATE AND SODIUM ACETATE, (B) BASIC ALUMINUM ACETATE AND LITHIUM ACETATE, (C) STANNOUS OXALATE AND LITHIUM ACETATE, (D) STANNOUS OXALATE AND SODIUM ACETATE, AND (E) DIBUTLY TIN OXIDE AND SOLDIUM ACETATE, THE PROPORTION OF THE SECOND CONSTITUENT IN EACH OF THE CATALYST COMPOSITIONS BEING FROM 25% TO 50% WEIGHT OF THE FIRST CONSTITUENT.
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) | 1965-09-24 | 1966-03-26 | 1966-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-09-24 | 1970-03-26 | 1970-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-09-24 | 1974-03-26 | 1974-09-25 | $7700.00 | Window Closed / Lapsed |