Patent US3347871A successfully refreshed from Google Patents.
US3347871A
Expired / Lapsed
US
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Novel bisphenols of spirobi (metadioxan) and their preparation
Assignee: Union Carbide Corp
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Filing: 1964-04-16
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Granted: 1967-10-17
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Expires: 1984-04-16
Abstract
No abstract record available.
Inventors
- 👤 Harding James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:58
CPC Classifications
C; C07; C07D; C07D493/00; C07D493/02; C07D493/10; C08; C08G; C08G59/00; C08G59/18; C08G59/20; C08G59/22; C08G59/26; C08G63/00; C08G63/66; C08G63/668; C08G63/672; C08G64/00; C08G64/04; C08G64/06; C08L; C08L75/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
7 words
THE BISPHENOL OF SPIROBI(META-DIOXAN) HAVING THE FORMULA
Claim 2
Dependent Claim
7 words
THE BISPHENOL OF SPIROBI(META-DIOXAN) HAVING THE FORMULA
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) | 1970-10-16 | 1971-04-17 | 1971-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-16 | 1975-04-17 | 1975-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-16 | 1979-04-17 | 1979-10-17 | $7700.00 | Window Closed / Lapsed |