Patent US2861981A successfully refreshed from Google Patents.
US2861981A
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Polyesters and isocyanate reaction products thereof
Assignee: Millennium Petrochemicals Inc
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Filing: 1954-02-05
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Granted: 1958-11-25
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Expires: 1974-02-05
Abstract
No abstract record available.
Inventors
- 👤 Charles E Frank
- 👤 Virgil L Hansley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:47
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/42; C08G18/4236; C08G18/4238; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08G63/52
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
54 words
AN ESTER OF AN ORGANIC CARBOXYLIC ACID AND A SATURATED ALIPHATIC GYLCOL HAVING ONLY CARBON ATOMS IN THE SKELETAL CHAIN AND HAVING A TOTAL OF FROM ABOUT EIGHT TO FOURTEEN CARBON ATOMS, AT LEAST ONE C2 BRANCH PER MOLECULE, AND THE TERMINAL HYDROXYL GROUPS OF WHICH ARE SEPARATED BY AT LEAST SIX CARBON ATOMS.
Claim 2
Dependent Claim
54 words
AN ESTER OF AN ORGANIC CARBOXYLIC ACID AND A SATURATED ALIPHATIC GYLCOL HAVING ONLY CARBON ATOMS IN THE SKELETAL CHAIN AND HAVING A TOTAL OF FROM ABOUT EIGHT TO FOURTEEN CARBON ATOMS, AT LEAST ONE C2 BRANCH PER MOLECULE, AND THE TERMINAL HYDROXYL GROUPS OF WHICH ARE SEPARATED BY AT LEAST SIX CARBON ATOMS.
References Cited (Backward Citations)
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Cited
US2585827A
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US2621166A
Cited
US2599468A
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US2729618A
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US2773092A
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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) | 1961-11-24 | 1962-05-26 | 1962-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-24 | 1966-05-26 | 1966-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-24 | 1970-05-26 | 1970-11-25 | $7700.00 | Window Closed / Lapsed |