Patent US3296205A successfully refreshed from Google Patents.
US3296205A
Expired / Lapsed
US
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Polymerization of gaseous formaldehyde
Assignee: Bayer AG
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Filing: 1963-07-02
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Granted: 1967-01-03
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Expires: 1983-07-02
Abstract
No abstract record available.
Inventors
- 👤 Kocher Ernest-Ulrich
- 👤 Kolb Fritz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:52
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/06; B; B01; B01J; B01J19/00; B01J19/08; B01J19/10; B01J8/00; B01J8/16; B01J8/18; B01J8/24; B01J8/38; B01J8/382; C08G2/08; B01J2208/00; B01J2208/00008; B01J2208/00017; B01J2208/00106; B01J2208/00115; B01J2208/00141; B01J2208/00796; B01J2208/00823; B01J2208/00858; B01J2208/00867
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
IN THE PROCESS OF POLYMERIZING GASEOUS FORMALDEHYDE BY CONTACTING A FLUIDIZED BED OF POLYOXYMETHYLENE AT A TEMPERATURE OF ABOUT 0*C. TO ABOUT 100*C. WITH A CONTINUOUS CURRENT OF A GASEOUS FEED STREAM CONTAINING FORMALDEHYDE IN THE PRESENCE OF A FORMALDEHYDE POLYMERIZATION CATALYST, THE IMPROVEMTN WHICH COMPRISES INTERRUPTING THE CONTINUOUS FLOW OF SAID FEED STREAM AT A FREQUENCY OF FROM 0.1 TO 1000 TIMES PER SECOND WHILE MAINTAINING SAID BED AS A FLUIDIZED BED.
Claim 2
Dependent Claim
73 words
IN THE PROCESS OF POLYMERIZING GASEOUS FORMALDEHYDE BY CONTACTING A FLUIDIZED BED OF POLYOXYMETHYLENE AT A TEMPERATURE OF ABOUT 0*C. TO ABOUT 100*C. WITH A CONTINUOUS CURRENT OF A GASEOUS FEED STREAM CONTAINING FORMALDEHYDE IN THE PRESENCE OF A FORMALDEHYDE POLYMERIZATION CATALYST, THE IMPROVEMTN WHICH COMPRISES INTERRUPTING THE CONTINUOUS FLOW OF SAID FEED STREAM AT A FREQUENCY OF FROM 0.1 TO 1000 TIMES PER SECOND WHILE MAINTAINING SAID BED AS A FLUIDIZED BED.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-01-02 | 1970-07-04 | 1971-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-02 | 1974-07-04 | 1975-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-02 | 1978-07-04 | 1979-01-03 | $7700.00 | Window Closed / Lapsed |