Patent US3287320A successfully refreshed from Google Patents.
US3287320A
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Spirobi (meta-dioxane) polyester resins
Assignee: Union Carbide Corp
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Filing: 1958-07-18
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Granted: 1966-11-22
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Expires: 1978-07-18
Abstract
No abstract record available.
Inventors
- 👤 Robert E Leech
- 👤 Julian K Rose
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:57
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/66; C08G63/668; C08G63/672; C08G63/68; C08G63/682; C08G63/6824; C08G63/6826
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
47 words
PROCESS FOR THE PRODUCTION OF RESINOUS CROSS-LIKED POLYESTERS WHICH COMPRISES FORMING A POLYESTER INTERMEDIATE CHARACTERIZED BY SOLUBILITY IN BENZENE, ACETONE, AND DIOXANE BY HEATING A CONDENSING AT TEMPERATURES WITHIN THE RANGE BETWEEN ABOUT 125*C. AND 275*C. IN AN INERT ATMOSPHERE (1) A SPIROBI(META-DIOXANE) COMPOUND HAVING THE STRUCTURE:
Claim 2
Dependent Claim
47 words
PROCESS FOR THE PRODUCTION OF RESINOUS CROSS-LIKED POLYESTERS WHICH COMPRISES FORMING A POLYESTER INTERMEDIATE CHARACTERIZED BY SOLUBILITY IN BENZENE, ACETONE, AND DIOXANE BY HEATING A CONDENSING AT TEMPERATURES WITHIN THE RANGE BETWEEN ABOUT 125*C. AND 275*C. IN AN INERT ATMOSPHERE (1) A SPIROBI(META-DIOXANE) COMPOUND HAVING THE STRUCTURE:
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) | 1969-11-21 | 1970-05-23 | 1970-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-21 | 1974-05-23 | 1974-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-21 | 1978-05-23 | 1978-11-22 | $7700.00 | Window Closed / Lapsed |