US2958677A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of polymers of the polyamide type
Assignee: Phillips Petroleum Co
•
Filing: 1955-05-10
•
Granted: 1960-11-01
•
Expires: 1975-05-10
Abstract
No abstract record available.
Inventors
- 👤 Roger F Kleinschmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:43
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08J3/14; C08J3/02; C08J3/09; C08J3/091; C08J2377/00; C08J2377/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
16 words
A PURIFICATION OF A SOLID POLYAMIDE WHICH IS CHARACTERIZED BY REPEATED INTRALINEAR UNITS OF THE FORMULA
Claim 2
Dependent Claim
16 words
A PURIFICATION OF A SOLID POLYAMIDE WHICH IS CHARACTERIZED BY REPEATED INTRALINEAR UNITS OF THE FORMULA
References Cited (Backward Citations)
US2265127A
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US2293760A
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FR883764A
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FR883763A
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US2404719A
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FR897257A
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US2473920A
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GB645033A
Cited
FR989062A
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US2592616A
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US2638463A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-11-01 | 1964-05-02 | 1964-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-01 | 1968-05-02 | 1968-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-01 | 1972-05-02 | 1972-11-01 | $7700.00 | Window Closed / Lapsed |