Patent US3218295A successfully refreshed from Google Patents.
US3218295A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolymers of formaldehyde with active hydrogen-containing polymers
Assignee: EIDP Inc
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Filing: 1961-02-24
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Granted: 1965-11-16
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Expires: 1981-02-24
Abstract
No abstract record available.
Inventors
- 👤 Cline Edward Terry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:56
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
A BLOCK COPOLYMER CONTAINING 10-99% BY WEIGHT OF SEGMENTS WHICH ARE OXYMETHYLENE CHAINS HAVING A MOLECULAR WEIGHT OF AT LEAST 3000 JOINED TO 1-90% BY WEIGHT OF SEGMENTS WHICH ARE THE RESIDUES OF A PREFORMED, HYDROCARBON SOLUBLE ORGANIC POLYMER HAVING A CHAIN COMPOSED OF ATOMS SELECTED FROM THE CLASS CONSISTING OF CARBON ATOMS AND CARBON ATOMS CONNECTED TO ATOMS SELECTED FROM THE CLASS CONSISTING OF OXYGEN, SULFUR AND PRIMARY AMINO NITROGEN, HAVING A MOLECULAR WEIGHT OF AT LEAST 500, BEING SUBSTANTIALLY FREE OF TERTIARY AMINO NITROGEN AND HAVING AT LEAST ONE ACTIVE HYDROGEN-CONTAINING GROUP SELECTED FROM THE CLASS CONSISTING OF MERCAPTO, HYDROXYL, PRIMARY AMINO, AND CARBOXYL.
Claim 2
Dependent Claim
106 words
A BLOCK COPOLYMER CONTAINING 10-99% BY WEIGHT OF SEGMENTS WHICH ARE OXYMETHYLENE CHAINS HAVING A MOLECULAR WEIGHT OF AT LEAST 3000 JOINED TO 1-90% BY WEIGHT OF SEGMENTS WHICH ARE THE RESIDUES OF A PREFORMED, HYDROCARBON SOLUBLE ORGANIC POLYMER HAVING A CHAIN COMPOSED OF ATOMS SELECTED FROM THE CLASS CONSISTING OF CARBON ATOMS AND CARBON ATOMS CONNECTED TO ATOMS SELECTED FROM THE CLASS CONSISTING OF OXYGEN, SULFUR AND PRIMARY AMINO NITROGEN, HAVING A MOLECULAR WEIGHT OF AT LEAST 500, BEING SUBSTANTIALLY FREE OF TERTIARY AMINO NITROGEN AND HAVING AT LEAST ONE ACTIVE HYDROGEN-CONTAINING GROUP SELECTED FROM THE CLASS CONSISTING OF MERCAPTO, HYDROXYL, PRIMARY AMINO, AND CARBOXYL.
References Cited (Backward Citations)
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US2350350A
Cited
FR1054343A
Cited
US2768994A
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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) | 1968-11-15 | 1969-05-17 | 1969-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-15 | 1973-05-17 | 1973-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-15 | 1977-05-17 | 1977-11-16 | $7700.00 | Window Closed / Lapsed |