US3250746A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of polymerization of acetaldehyde and formaldehyde in solution
Assignee: Charbonnages de France CDF
•
Filing: 1962-07-12
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Granted: 1966-05-10
•
Expires: 1982-07-12
Abstract
No abstract record available.
Inventors
- 👤 Letort Maurice Joseph Amand
- 👤 Fleureau Bernard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:34
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/18; C08G2/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
39 words
A METHOD FOR PRODUCING A COPOLYMER OF FORMALDEHYDE AND ACETALDEHYDE COMPRISING REACTING FORMALDEHYDE AND ACETALDEHYDE IN THE PRESENCE OF NAPHTHALENE-SODIUM CATALYST AND DEHYDRATED TETRAHYDROFURAN SOLVENT IN A REACTION ZONE MAINTAINED AT A TEMPERATURE BETWEEN -- 61* C. AND -65*C.
Claim 2
Independent Claim
39 words
A METHOD FOR PRODUCING A COPOLYMER OF FORMALDEHYDE AND ACETALDEHYDE COMPRISING REACTING FORMALDEHYDE AND ACETALDEHYDE IN THE PRESENCE OF NAPHTHALENE-SODIUM CATALYST AND DEHYDRATED TETRAHYDROFURAN SOLVENT IN A REACTION ZONE MAINTAINED AT A TEMPERATURE BETWEEN -- 61* C. AND -65*C.
References Cited (Backward Citations)
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US2848437A
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US2989508A
Cited
GB870775A
Cited
US3030315A
Cited
AT220367B
Cited
US3067174A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-05-09 | 1969-11-08 | 1970-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-09 | 1973-11-08 | 1974-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-09 | 1977-11-08 | 1978-05-10 | $7700.00 | Window Closed / Lapsed |