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US3536670A
Expired / Lapsed
US
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Polycarbonates from bis-hydroxy(-alkyl and -aryl)pyromellitic diimides
Assignee: General Mills Inc
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Filing: 1969-05-26
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Granted: 1970-10-27
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Expires: 1989-05-26
Abstract
No abstract record available.
Inventors
- 👤 David Aelony
- 👤 Arthur J Coury
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:54
CPC Classifications
C; C08; C08G; C08G64/00; C08G73/00; C08G73/06; C08G73/10; C08G73/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3205199A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-26 | 1974-04-27 | 1974-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-26 | 1978-04-27 | 1978-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-26 | 1982-04-27 | 1982-10-27 | $7700.00 | Window Closed / Lapsed |