US3021269A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of branched polymers
Assignee: Wyeth Holdings LLC
•
Filing: 1957-06-05
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Granted: 1962-02-13
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Expires: 1977-06-05
Abstract
No abstract record available.
Inventors
- 👤 Mary L Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:57
CPC Classifications
C; C08; C08F; C08F285/00; C08F8/00; C08F8/44; C08F261/00; C08F261/02; C08F261/04; Y; Y10; Y10S; Y10S8/00; Y10S8/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
24 words
A METHOD OF PREPARING A BRANCHED POLYMER WHICH COMPRISES CROSS-LINKED POLYMERS OF COMPOUNDS SELECTED FROM THE GROUP CONSISTING OF THOSE HAVING THE GENERAL FORMULAS
Claim 2
Independent Claim
24 words
A METHOD OF PREPARING A BRANCHED POLYMER WHICH COMPRISES CROSS-LINKED POLYMERS OF COMPOUNDS SELECTED FROM THE GROUP CONSISTING OF THOSE HAVING THE GENERAL FORMULAS
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-02-12 | 1965-08-14 | 1966-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-12 | 1969-08-14 | 1970-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-12 | 1973-08-14 | 1974-02-13 | $7700.00 | Window Closed / Lapsed |