Patent US2503252A successfully refreshed from Google Patents.
US2503252A
Expired / Lapsed
US
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Halogenation of polymers
Assignee: EIDP Inc
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Filing: 1947-06-27
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Granted: 1950-04-11
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Expires: 1967-06-27
Abstract
No abstract record available.
Inventors
- 👤 Maurice L Ernsberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:45
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/18; C08F8/20
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
105 words
IN THE REPLACEMENT, BY HALOGEN OF ATOMIC NUMBER 18N-1 WHERE N IS AN INTEGER FROM 1 TO 2, OF HYDROGEN OF AN ADDITION POLYMER OF MOLECULAR WEIGHT ABOVE 1000 AND CONTAINING A PLURALITY OF -CH2- GROUPS, THE IMPROVEMENT WHEREIN THERE IS EMPLOYED AS INITIATOR FOR THE HALOGENATION AN ALIPHATIC AZO COMPOUND HAVING BOTH VALENCES OF THE, AZO, -N=N-, GROUP ATTACHED TO CARBONS AT LEAST ONE OF WHICH IS A TERTIARY ALIPHATIC CARBON WHICH IS IN TURN JOINED TO A NEGATIVE MONOVALENT RADICAL, THROUGH A CARBON OF SAID RADICAL, WHICH LATTER CARBON HAS ITS THREE REMAINING VALENCES SATISFIED BY ELEMENTS OF ATOMIC NUMBER SEVEN TO EIGHT.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-04-10 | 1953-10-10 | 1954-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-10 | 1957-10-10 | 1958-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-10 | 1961-10-10 | 1962-04-11 | $7700.00 | Window Closed / Lapsed |