US3204012A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of polymerization of formaldehyde
Assignee: Kurashiki Rayon Co Ltd
•
Filing: 1961-10-03
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Granted: 1965-08-31
•
Expires: 1981-10-03
Abstract
No abstract record available.
Inventors
- 👤 Eguchi Tamotsu
- 👤 Fujiwara Takatoshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:27
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/06; C08G2/08; Y; Y10; Y10S; Y10S8/00; Y10S8/10; Y10S8/21
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
32 words
A METHOD FOR THE PREPARATION OF HIGH MOLECULAR WEIGHT FORMALDEHYDE POLYMERS COMPRISING CONTACTING SUBSTANTIALLY ANHYDROUS GASEOUS FORMALDEHYDE WITH A SOLID HIGH POLYMER SELECTED FROM THE GROUP CONSISTING OF POLYAMIDES, POLYUREAS, AND POLYURETHANES.
Claim 2
Independent Claim
32 words
A METHOD FOR THE PREPARATION OF HIGH MOLECULAR WEIGHT FORMALDEHYDE POLYMERS COMPRISING CONTACTING SUBSTANTIALLY ANHYDROUS GASEOUS FORMALDEHYDE WITH A SOLID HIGH POLYMER SELECTED FROM THE GROUP CONSISTING OF POLYAMIDES, POLYUREAS, AND POLYURETHANES.
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) | 1968-08-30 | 1969-03-01 | 1969-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-30 | 1973-03-01 | 1973-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-30 | 1977-03-01 | 1977-08-31 | $7700.00 | Window Closed / Lapsed |