US3260698A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crystalline polyvinyl ethers prepared with chromic anhydride catalysts
Assignee: Mitsubishi Chemical Corp
•
Filing: 1962-01-05
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Granted: 1966-07-12
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Expires: 1982-01-05
Abstract
No abstract record available.
Inventors
- 👤 Nakano Senji
- 👤 Iwasaki Koichiro
- 👤 Fukutani Hideo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:01
CPC Classifications
C; C08; C08F; C08F16/00; C08F16/12; Y; Y10; Y10T; Y10T24/00; Y10T24/15; Y10T24/155
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
22 words
A METHOD OF PRODUCING CRYSTALLINE POLYVINYL ETHERS WHICH CONSISTS EESSENTIALLY IN PLACING IN A REACTION VESSEL A VINYL ETHER OF THE FORMULA-
Claim 2
Independent Claim
22 words
A METHOD OF PRODUCING CRYSTALLINE POLYVINYL ETHERS WHICH CONSISTS EESSENTIALLY IN PLACING IN A REACTION VESSEL A VINYL ETHER OF THE FORMULA-
Claim 3
Dependent Claim
43 words
A METHOD ACCORDING TO CLAIM 1 CHARACTERIZED IN THAT A SUBSTITUTED PHENOL ANTIOXIDANT IS PRESENT IN THE REACTION MIXTURE, THE SUBSTITUENT BEING TAKEN FROM THE CLASS CONSISTING OF ALKYL, ARYL, ARALKYL AND CYCLOALKYL, AND OH DERIVATIVES THEREOF, SAID SUBSTITUENT HAVING 1-8 CARBON ATOMS.
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) | 1969-07-11 | 1970-01-10 | 1970-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-11 | 1974-01-10 | 1974-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-11 | 1978-01-10 | 1978-07-12 | $7700.00 | Window Closed / Lapsed |