Patent US3216970A successfully refreshed from Google Patents.
US3216970A
Expired / Lapsed
US
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Production of linear aromatic polyesters containing isophthalic acid
Assignee: Gevaert Photo Producten NV
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Filing: 1958-04-30
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Granted: 1965-11-09
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Expires: 1978-04-30
Abstract
No abstract record available.
Inventors
- 👤 Conix Andre Jan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:01
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08G63/18; C08G63/19; C08G63/193; C08G63/181; C08G63/185; C08G63/40; C08G63/52; C08G63/54; C08G63/547
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
44 words
A HIGH MOLECULAR WEIGHT LINEAR POLYESTER OF POLYBASIC ACID AND POLYHUDRIC ALCOHOL, SAID POLYBASIC ACID CONSISTING ESSENTIALLY OF FROM ABOUT 75-100 MOL PERCENT ISOPHTHALIC ACID AND ABOUT 25-0 MOL PERCENT TEREPHTHALIC ACID, SAID POLYHYDRIC ALCOHOL COMPRISING AT LEAST ONE BISPHENOLIC COMPOUND OF THE FORMULA
Claim 2
Dependent Claim
44 words
A HIGH MOLECULAR WEIGHT LINEAR POLYESTER OF POLYBASIC ACID AND POLYHUDRIC ALCOHOL, SAID POLYBASIC ACID CONSISTING ESSENTIALLY OF FROM ABOUT 75-100 MOL PERCENT ISOPHTHALIC ACID AND ABOUT 25-0 MOL PERCENT TEREPHTHALIC ACID, SAID POLYHYDRIC ALCOHOL COMPRISING AT LEAST ONE BISPHENOLIC COMPOUND OF THE FORMULA
References Cited (Backward Citations)
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Cited
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US2595343A
Cited
US2708617A
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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) | 1968-11-08 | 1969-05-10 | 1969-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-08 | 1973-05-10 | 1973-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-08 | 1977-05-10 | 1977-11-09 | $7700.00 | Window Closed / Lapsed |