US3198771A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amorphous polyamides from aromatic dicarboxylic acids and an ethyl substituted alkylene diamine
Assignee: WR Grace and Co
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Filing: 1961-06-30
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Granted: 1965-08-03
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Expires: 1981-06-30
Abstract
No abstract record available.
Inventors
- 👤 Gabler Rudolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:06
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
A LINEAR AMOPRHOUS FILM-FORMING POLYAMIDE OF AN AROMATIC DICARBOXYLIC ACID SELECTED FROM THE GROUP CONSISTING OF TEREPHTHALIC ACID, INSOPHTHALIC ACID AND AN ACID MIXTURE OF 90 TO 95 PERCENT TEREPHTHALIC ACID AND 5 TO 10 PERCENT ISOPHTHALIC ACID CONSISTING OF RECURRING STRUCTURAL UNITS OF THE FORMULA
Claim 2
Dependent Claim
46 words
A LINEAR AMOPRHOUS FILM-FORMING POLYAMIDE OF AN AROMATIC DICARBOXYLIC ACID SELECTED FROM THE GROUP CONSISTING OF TEREPHTHALIC ACID, INSOPHTHALIC ACID AND AN ACID MIXTURE OF 90 TO 95 PERCENT TEREPHTHALIC ACID AND 5 TO 10 PERCENT ISOPHTHALIC ACID CONSISTING OF RECURRING STRUCTURAL UNITS OF 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) | 1968-08-02 | 1969-02-01 | 1969-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-02 | 1973-02-01 | 1973-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-02 | 1977-02-01 | 1977-08-03 | $7700.00 | Window Closed / Lapsed |