Patent US2734889A successfully refreshed from Google Patents.
US2734889A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the polymerization of form-
Assignee: —
•
Filing: 1954-04-16
•
Granted: 1956-02-14
•
Expires: 1974-04-16
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:26
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/06; C08G2/08; C08G2/30; C08G2/32; Y; Y10; Y10S; Y10S74/00; Y10S74/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
42 words
A PROCESS OF POLYMERIZING FORMALDEHYDE COMPRISING CONTACTING SUBSTANTIALLY ANHYDROUS MONOMERIC FORMALDEHYDE WITH A CATALYST AMOUNT OF POLYMERIZATION INITIATOR WHICH IS A CARBONYL OF A METAL FROM GROUP VIII OF THE PERIODIC TABLE, AND RECOVERING A HIGH MOLECULAR WEIGHT ADDITION POLYMER OF FORMALDEHYDE.
Claim 2
Dependent Claim
42 words
A PROCESS OF POLYMERIZING FORMALDEHYDE COMPRISING CONTACTING SUBSTANTIALLY ANHYDROUS MONOMERIC FORMALDEHYDE WITH A CATALYST AMOUNT OF POLYMERIZATION INITIATOR WHICH IS A CARBONYL OF A METAL FROM GROUP VIII OF THE PERIODIC TABLE, AND RECOVERING A HIGH MOLECULAR WEIGHT ADDITION POLYMER OF FORMALDEHYDE.
References Cited (Backward Citations)
US2296249A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-02-13 | 1959-08-15 | 1960-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-02-13 | 1963-08-15 | 1964-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-02-13 | 1967-08-15 | 1968-02-14 | $7700.00 | Window Closed / Lapsed |