Patent US2620327A successfully refreshed from Google Patents.
US2620327A
Expired / Lapsed
US
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Polyamides and their preparation
Assignee: EIDP Inc
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Filing: 1950-03-13
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Granted: 1952-12-02
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Expires: 1970-03-13
Abstract
No abstract record available.
Inventors
- 👤 Jr Charles J Albisetti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:59
CPC Classifications
C; C08; C08G; C08G69/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
20 words
A POLYAMIDE CONTAINING A PLURALITY OF STRUCTURAL UNITS AND AS THE SOLE RECURRING UNIT, THE STRUCTURAL UNIT HAVING THE FORMULA:
Claim 2
Dependent Claim
20 words
A POLYAMIDE CONTAINING A PLURALITY OF STRUCTURAL UNITS AND AS THE SOLE RECURRING UNIT, THE STRUCTURAL UNIT HAVING THE FORMULA:
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-02 | 1956-06-02 | 1956-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-02 | 1960-06-02 | 1960-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-02 | 1964-06-02 | 1964-12-02 | $7700.00 | Window Closed / Lapsed |