Patent US3219631A successfully refreshed from Google Patents.
US3219631A
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Copolymers of cyclic acetals with oxacyclopropane or oxacyclobutane or the derivatives thereof and process for preparing said copolymers
Assignee: Hoechst AG
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Filing: 1961-11-15
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Granted: 1965-11-23
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Expires: 1981-11-15
Abstract
No abstract record available.
Inventors
- 👤 Kullmar Klaus
- 👤 Gutweiler Klemens
- 👤 Weissermel Klaus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:48
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/06; C08G2/18; C08G2/22; C08G65/00; C08G65/02; C08G65/04; C08G65/06; C08G65/08; C08G65/10; C08G65/105; C08G65/26; C08G65/2642; C08G65/2645
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
30 words
A PROCESS FOR THE MANUFACTURE OF HIGH MOLECULAR WEIGHT COPOLYMERS WHICH COMPRISES COPOLYMERIZING TRIOXANE WITH AT LEAST ONE CYCLIC ETHER SELECTED FROM THE GROUP CONSISTING OF COMPOUNDS OF THE FORMULAS
Claim 2
Dependent Claim
30 words
A PROCESS FOR THE MANUFACTURE OF HIGH MOLECULAR WEIGHT COPOLYMERS WHICH COMPRISES COPOLYMERIZING TRIOXANE WITH AT LEAST ONE CYCLIC ETHER SELECTED FROM THE GROUP CONSISTING OF COMPOUNDS OF THE FORMULAS
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) | 1968-11-22 | 1969-05-24 | 1969-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-22 | 1973-05-24 | 1973-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-22 | 1977-05-24 | 1977-11-23 | $7700.00 | Window Closed / Lapsed |