US3281499A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Block copolymers containing an interior segment of oxymetehylene polymer and polymers of ethylenically unsaturated monomers as exterior segments
Assignee: Celanese Corp
•
Filing: 1962-02-27
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Granted: 1966-10-25
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Expires: 1982-02-27
Abstract
No abstract record available.
Inventors
- 👤 Dolce Thomas Joseph
- 👤 Stuetz Dagobert Engelbert
- 👤 Roberts William John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:23
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/18; C08F; C08F283/00; C08F283/06; C08G2/22; C08G2/24; C08G2/38; C08G4/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
A PROCESS FOR THE PREPARATION OF HIGH MOLECULAR WEIGHT MOLDABLE POLYMERIC PRODUCTS COMPRISING REACTING (A) A POLYACETAL PREPOLYMER HAVING POLYMERIC CHAINS CONSISTING ESSENTIALLY OF A MAJOR PROPORTION OF RECURRING OXYMETHYLENE (-CH2O-) UNITS, SAID POLYMERIC CHAINS HAVING A MOLECULAR WEIGHT OF AT LEAST 6,000; AND (B) A MONOETHYLENICALLY UNSATURATED COMPOUND I IN THE PRESENCE OF A FREE YIELDING COMPOUND TO PRODUCE A POLYMERIC PRODUCT COMPRISING (1) AT LEAST ONE POLYMERIC CHAIN SEGMENT CONSISTING ESSENTIALLY OF A MAJOR PORPORTION OF RECURRING OXYMETHYLENE (-CH2O-) UNITS, AND DIRECTLY CHEMICALLY BONDED THERETO, (2) AT LEAST ONE DIRECTLY CHEMICALLY SEGMENT CONSISTING ESSENTIALLY OF RECURRING UNITS DERIVED FROM SAID MONOETHYLENICALLY UNSATURATED COMPOUND.
Claim 2
Dependent Claim
105 words
A PROCESS FOR THE PREPARATION OF HIGH MOLECULAR WEIGHT MOLDABLE POLYMERIC PRODUCTS COMPRISING REACTING (A) A POLYACETAL PREPOLYMER HAVING POLYMERIC CHAINS CONSISTING ESSENTIALLY OF A MAJOR PROPORTION OF RECURRING OXYMETHYLENE (-CH2O-) UNITS, SAID POLYMERIC CHAINS HAVING A MOLECULAR WEIGHT OF AT LEAST 6,000; AND (B) A MONOETHYLENICALLY UNSATURATED COMPOUND I IN THE PRESENCE OF A FREE YIELDING COMPOUND TO PRODUCE A POLYMERIC PRODUCT COMPRISING (1) AT LEAST ONE POLYMERIC CHAIN SEGMENT CONSISTING ESSENTIALLY OF A MAJOR PORPORTION OF RECURRING OXYMETHYLENE (-CH2O-) UNITS, AND DIRECTLY CHEMICALLY BONDED THERETO, (2) AT LEAST ONE DIRECTLY CHEMICALLY SEGMENT CONSISTING ESSENTIALLY OF RECURRING UNITS DERIVED FROM SAID MONOETHYLENICALLY UNSATURATED COMPOUND.
References Cited (Backward Citations)
US2373561A
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GB807589A
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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) | 1969-10-24 | 1970-04-25 | 1970-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-24 | 1974-04-25 | 1974-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-24 | 1978-04-25 | 1978-10-25 | $7700.00 | Window Closed / Lapsed |