Patent US5701456A successfully refreshed from Google Patents.
Patent US3017389A successfully refreshed from Google Patents.
US3017389A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of controlling the molecular weight of linear formaldehyde polymers
Assignee: EIDP Inc
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Filing: 1955-03-18
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Granted: 1962-01-16
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Expires: 1975-03-18
Abstract
No abstract record available.
Inventors
- 👤 Jr William Philip Langsdorf
- 👤 Macdonald Robert Neal
- 👤 Schweitzer Carl Earle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:27
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/04; C08G2/06; C08G2/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
THE PROCESS OF PREPARING AN ADDTION POLYMER OF FORMALDEHYDE WITH A REDUCED NUMBER AVERAGE MOLECULAR WEIGHT OF 10,000 TO ABOUT 100,000 COMPRISING CONTINUOUSLY INTRODUCAING SUBSTANTIALLY ANHYDROUS FORMALDEHYDE INTO AN INERT LIQUID HYDROCARBON MEDIUM CONTAINING A FORMALDEHYDE POLYMERIZATION INITATOR AND A SMALL AMOUNT OF AN ORGANIC CHAIN TRANSFER AGENT HAVING A DEGREE OF POLYMERIZATION LESS THAN 10, BEIONG FREE OF AMINE GROUPS AND PHNOL GROUPS, AND BEING SELECTED FROM THE GROUP CONSISTING OF MONOFUNCTIONAL ESTERS HAVING AT LEAST 3 CARBON ATOMS, ALIPHATIC ALCOHOLS HAVING AT LEAST 2 CARBON ATOMS, CYCLOAPHATIC ALCOHOLS HAROMATIC ALCOHOLS, ACID ANHYDRIDES, AMIDES, IMIDES, HALIDES, CARBONATES, SILICATES, PHOSPHITES, PHOSPHATES, THUOPHANES, SULFIDES, CYCLIC SULFOXIDES, AND NITRO COMPOUNDS HAVING A HYDROGEN ON THE CARBON ALPHA TO THE NITRO GROUP, AND RECOVERING AN ADDITION POLYMER OF FORMALDEHYDE HAVING A NUMBER AVERAGE MOLECULAR WEIGHT 10,000 TO 100,000.
Claim 2
Dependent Claim
135 words
THE PROCESS OF PREPARING AN ADDTION POLYMER OF FORMALDEHYDE WITH A REDUCED NUMBER AVERAGE MOLECULAR WEIGHT OF 10,000 TO ABOUT 100,000 COMPRISING CONTINUOUSLY INTRODUCAING SUBSTANTIALLY ANHYDROUS FORMALDEHYDE INTO AN INERT LIQUID HYDROCARBON MEDIUM CONTAINING A FORMALDEHYDE POLYMERIZATION INITATOR AND A SMALL AMOUNT OF AN ORGANIC CHAIN TRANSFER AGENT HAVING A DEGREE OF POLYMERIZATION LESS THAN 10, BEIONG FREE OF AMINE GROUPS AND PHNOL GROUPS, AND BEING SELECTED FROM THE GROUP CONSISTING OF MONOFUNCTIONAL ESTERS HAVING AT LEAST 3 CARBON ATOMS, ALIPHATIC ALCOHOLS HAVING AT LEAST 2 CARBON ATOMS, CYCLOAPHATIC ALCOHOLS HAROMATIC ALCOHOLS, ACID ANHYDRIDES, AMIDES, IMIDES, HALIDES, CARBONATES, SILICATES, PHOSPHITES, PHOSPHATES, THUOPHANES, SULFIDES, CYCLIC SULFOXIDES, AND NITRO COMPOUNDS HAVING A HYDROGEN ON THE CARBON ALPHA TO THE NITRO GROUP, AND RECOVERING AN ADDITION POLYMER OF FORMALDEHYDE HAVING A NUMBER AVERAGE MOLECULAR WEIGHT 10,000 TO 100,000.
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) | 1965-01-15 | 1965-07-17 | 1966-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-01-15 | 1969-07-17 | 1970-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-01-15 | 1973-07-17 | 1974-01-16 | $7700.00 | Window Closed / Lapsed |