Patent US2552327A successfully refreshed from Google Patents.
US2552327A
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Organic nitrogen compounds used to modify physical properties of thermoplastic polymers
Assignee: Wyeth Holdings LLC
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Filing: 1947-07-25
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Granted: 1951-05-08
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Expires: 1967-07-25
Abstract
No abstract record available.
Inventors
- 👤 Edward L Kropa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:02
CPC Classifications
C; C08; C08F; C08F120/00; C08F120/02; C08F120/10; C08F120/12; C08F120/16; C08F120/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2133257A
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GB540169A
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US2443735A
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US2346107A
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US2380475A
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US2380474A
Cited
FR883679A
Cited
US2380710A
Cited
US2430591A
Cited
US2450552A
Cited
US2452669A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-07 | 1954-11-06 | 1955-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-07 | 1958-11-06 | 1959-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-07 | 1962-11-06 | 1963-05-08 | $7700.00 | Window Closed / Lapsed |