Patent US3250738A successfully refreshed from Google Patents.
US3250738A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Unsaturated polyesters and vinyl chloride polymers modified therewith
Assignee: WR Grace and Co
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Filing: 1961-10-30
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Granted: 1966-05-10
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Expires: 1981-10-30
Abstract
No abstract record available.
Inventors
- 👤 Philip K Isaacs
- 👤 Elizabeth C Dearborn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:55
CPC Classifications
C; C08; C08L; C08L27/00; C08L27/02; C08L27/04; C08L27/06; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/52; C08G63/66; C08G63/668; C08G63/676; C08K; C08K3/00; C08K3/02; C08K3/04; C08K3/18; C08K3/20; C08K3/24; C08K3/34; C08K5/00; C08K5/04; C08K5/14; C08K7/00; C08K7/02; C08K7/04; C08K7/10; C08K7/12; C08L67/00; C08L67/02; C08L67/06
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
139 words
AN UNSATURATED POLYESTER CONSISTING OF THE CONDENSATION PRODUCT OF (A) A SATURATED ALIPHATIC GLYCOL CONTAINING 2 TO 6 CARBON ATOMS, (B) A DICARBOXYLIC ACID SELECTED FROM THE GROUP CONSISTING OF SATURATED ALIPHATIC DICARBOXYLIC ACIDS CONTAINING 4 TO 10 CARBON ATOMS, PHTHALIC ACID, AND PHTHALIC ANHYDRIDE, (C) COMPOUND FOR TERMINATING THE GROWTH OF THE POLYESTER CHAIN SELECTED FROM THE GROUP CONSISTING OF MONOCARBOXYLIC ACIDS AND MONOHYDROXY ALCOHOLS, (D) A BUTENE DIOIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF MALEIC ACID, FUMARIC ACID, MALEIC ANHYDRIDE, AND MIXTURES THEREOF, SAID REACTANTS (A), (B), (C) AND (D) BEING PRESENT IN SUCH PROPORTIONS AS TO PRODUCE A POLYESTER WHICH IS SUBSTANTIALLY COMPLETELY DEVOID OF TERMINAL CARBOXYL AND HYDROXYL GROUPS, SAID POLYESTER HAVING AN AVERAGE MOLECULAR WEIGHT OF BETWEEN ABOUT 300 AND 4000 AND CONTAINING BETWEEN ABOUT 1 AND 2.5 BUTENE DIOATE GROUPS PER MOLECULE.
Claim 2
Dependent Claim
139 words
AN UNSATURATED POLYESTER CONSISTING OF THE CONDENSATION PRODUCT OF (A) A SATURATED ALIPHATIC GLYCOL CONTAINING 2 TO 6 CARBON ATOMS, (B) A DICARBOXYLIC ACID SELECTED FROM THE GROUP CONSISTING OF SATURATED ALIPHATIC DICARBOXYLIC ACIDS CONTAINING 4 TO 10 CARBON ATOMS, PHTHALIC ACID, AND PHTHALIC ANHYDRIDE, (C) COMPOUND FOR TERMINATING THE GROWTH OF THE POLYESTER CHAIN SELECTED FROM THE GROUP CONSISTING OF MONOCARBOXYLIC ACIDS AND MONOHYDROXY ALCOHOLS, (D) A BUTENE DIOIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF MALEIC ACID, FUMARIC ACID, MALEIC ANHYDRIDE, AND MIXTURES THEREOF, SAID REACTANTS (A), (B), (C) AND (D) BEING PRESENT IN SUCH PROPORTIONS AS TO PRODUCE A POLYESTER WHICH IS SUBSTANTIALLY COMPLETELY DEVOID OF TERMINAL CARBOXYL AND HYDROXYL GROUPS, SAID POLYESTER HAVING AN AVERAGE MOLECULAR WEIGHT OF BETWEEN ABOUT 300 AND 4000 AND CONTAINING BETWEEN ABOUT 1 AND 2.5 BUTENE DIOATE GROUPS PER MOLECULE.
Claim 3
Dependent Claim
36 words
A POLYESTER ACCORDING TO CLAIM 1 WHEREIN AN EXCESS OF DICARBOXYLIC ACID IS USED AND MONOHYDROXY ALCOHOL IS ADDED IN AMOUNT SUFFICIENT TO REACT WITH THE EXCESS ACID TO TERMINATE THE GROWTH OF THE POLYESTER CHAIN.
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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) | 1969-05-09 | 1969-11-08 | 1970-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-09 | 1973-11-08 | 1974-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-09 | 1977-11-08 | 1978-05-10 | $7700.00 | Window Closed / Lapsed |