US3249588A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing finely divided polyimide particles of high surface area
Assignee: EIDP Inc
•
Filing: 1962-06-06
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Granted: 1966-05-03
•
Expires: 1982-06-06
Abstract
No abstract record available.
Inventors
- 👤 Gall Walter George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:30
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1003; C08G73/1007; C08G73/1028; C08J; C08J3/00; C08J3/12; C08J2379/00; C08J2379/04; C08J2379/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
37 words
A PROCESS FOR PREPARING A PARTICULATE, FINELY-DIVIDED POWDER OF AT LEAST ONE POLYIMIDE WHICH COMPRISES STEPS OF: (A) REACTING AT LEAST ONE DIAMINE HAVING THE STRUCTURAL FORMULA H2N-R1-NH2 WHEREIN R'' IS SELECTED FROM THE GROUP CONSISTING OF
Claim 2
Dependent Claim
37 words
A PROCESS FOR PREPARING A PARTICULATE, FINELY-DIVIDED POWDER OF AT LEAST ONE POLYIMIDE WHICH COMPRISES STEPS OF: (A) REACTING AT LEAST ONE DIAMINE HAVING THE STRUCTURAL FORMULA H2N-R1-NH2 WHEREIN R'' IS SELECTED FROM THE GROUP CONSISTING OF
References Cited (Backward Citations)
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US2712543A
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US2731447A
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US2880230A
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US2900369A
Cited
US3049518A
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US3037966A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-05-02 | 1969-11-01 | 1970-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-02 | 1973-11-01 | 1974-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-02 | 1977-11-01 | 1978-05-03 | $7700.00 | Window Closed / Lapsed |