Patent US3428602A successfully refreshed from Google Patents.
US3428602A
Expired / Lapsed
US
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Process of making thick polyimide structures
Assignee: 3M Co
•
Filing: 1967-06-13
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Granted: 1969-02-18
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Expires: 1987-06-13
Abstract
No abstract record available.
Inventors
- 👤 James R Haller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:00
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1003; C08G73/1007; C08G73/1028
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3179614A
Cited
US3179630A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-18 | 1972-08-19 | 1973-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-18 | 1976-08-19 | 1977-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-18 | 1980-08-19 | 1981-02-18 | $7700.00 | Window Closed / Lapsed |