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US3194789A
Expired / Lapsed
US
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Polymerization of formaldehyde
Assignee: Kanegafuchi Spinning Co Ltd
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Filing: 1962-01-29
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Granted: 1965-07-13
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Expires: 1982-01-29
Abstract
No abstract record available.
Inventors
- 👤 Oba Hiroo
- 👤 Nakahara Masataka
- 👤 Naito Hisao
- 👤 Osada Yoshihiro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:10
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/06; C08G2/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
A PROCESS FOR PREPARING A HIGH MOLECULAR WEIGHT FORMALDEHYDE POLYMER WHICH COMPRISES CONTACTING GASEOUS MONOMERIC FORMALDEHYDE, IN THE ABSENCE OF ANY LIQUID MEDIUM, WITH A SOLID CATALYST SELECTED FROM THE GROUP CONSISTING OF SALTS OF OXYACIDS OF BORON, CARBON, PHOSPHORUS AND SULFUR WITH AN ELEMENT SELECTED FROM THE GROUP CONSISTING OF THOSE BELONGING TO GROUP II OF THE PERIODIC TABLE, LEAD, MANGANESE, NICKEL, AND COBALT, AND RECOVERING THE HIGH MOLECULAR WEIGHT FORMALDEHYDE POLYMER PRODUCED.
Claim 2
Dependent Claim
74 words
A PROCESS FOR PREPARING A HIGH MOLECULAR WEIGHT FORMALDEHYDE POLYMER WHICH COMPRISES CONTACTING GASEOUS MONOMERIC FORMALDEHYDE, IN THE ABSENCE OF ANY LIQUID MEDIUM, WITH A SOLID CATALYST SELECTED FROM THE GROUP CONSISTING OF SALTS OF OXYACIDS OF BORON, CARBON, PHOSPHORUS AND SULFUR WITH AN ELEMENT SELECTED FROM THE GROUP CONSISTING OF THOSE BELONGING TO GROUP II OF THE PERIODIC TABLE, LEAD, MANGANESE, NICKEL, AND COBALT, AND RECOVERING THE HIGH MOLECULAR WEIGHT FORMALDEHYDE POLYMER PRODUCED.
References Cited (Backward Citations)
US2519550A
Cited
US2848437A
Cited
FR1211002A
Cited
US2964500A
Cited
US3005799A
Cited
FR1300492A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-07-12 | 1969-01-11 | 1969-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-07-12 | 1973-01-11 | 1973-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-07-12 | 1977-01-11 | 1977-07-13 | $7700.00 | Window Closed / Lapsed |