US3700649A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyimides of benzophenone tetracarboxylic acid esters and aromatic diamines having a basicity constant of less than 10-" and method of preparation
Assignee: I M L Corp A CORP OF DE
•
Filing: 1971-07-06
•
Granted: 1972-10-24
•
Expires: 1991-07-06
Abstract
Abstract MONOMERIC, RESINOID, SOLID STATE SOLUTIONS OF CERTAIN AROMATIC DIAMINES IN DERIVATIVES OF BENZOPHENONETETRACARBOXYLIC ACID. PROCESS FOR PREPARING SUCH SOLUTIONS AND FOR CONVERTING THEM TO POLYIMIDES AND TO POLYAMIC ACID PRECURSORS.
Inventors
- 👤 William R Boram
- 👤 Luis Acle Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:41
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1067; C08G73/1085; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24149; Y10T428/31504; Y10T428/31551; Y10T428/31623; Y10T428/31678; Y10T428/31681; Y10T428/31725
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |