Patent US3373466A successfully refreshed from Google Patents.
US3346540A
Expired / Lapsed
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Process for the production of formaldehyde-cyclic formal copolymers
Assignee: Kurashiki Rayon Co Ltd
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Filing: 1964-06-15
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Granted: 1967-10-10
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Expires: 1984-06-15
Abstract
No abstract record available.
Inventors
- 👤 Eguchi Tamotsu
- 👤 Yamauchi Junnosuke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:10
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/06; C08G2/08; C08G2/12; C08G2/14; C08G2/16; C08G2/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
38 words
A PROCESS FOR THE PRODUCTION OF HIGH MOLECULAR WEIGHT FORMADEHYDE COPOLYMERS HAVING IMPROVED THERMAL STABILITY WHICH COMPRISES CONTACTING THE INGREDIENTS OF A MIXTURE CONSISTING ESSENTIALLY OF AN ACIDIC CATALYST, FORMALDEHYDE AND A CYCLIC FORMAL REPRESENTED BY THE STRUCTURE
Claim 2
Dependent Claim
38 words
A PROCESS FOR THE PRODUCTION OF HIGH MOLECULAR WEIGHT FORMADEHYDE COPOLYMERS HAVING IMPROVED THERMAL STABILITY WHICH COMPRISES CONTACTING THE INGREDIENTS OF A MIXTURE CONSISTING ESSENTIALLY OF AN ACIDIC CATALYST, FORMALDEHYDE AND A CYCLIC FORMAL REPRESENTED BY 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) | 1970-10-09 | 1971-04-10 | 1971-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-09 | 1975-04-10 | 1975-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-09 | 1979-04-10 | 1979-10-10 | $7700.00 | Window Closed / Lapsed |