US3386880A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of forming paper containing polyethyleneimine cross-linked with methylene-bis-acrylamide and paper thereof
Assignee: Ortech Corp
•
Filing: 1965-03-22
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Granted: 1968-06-04
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Expires: 1985-03-22
Abstract
No abstract record available.
Inventors
- 👤 Lomas Harold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:29
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/54; D21H17/56
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2801169A
Cited
US3052669A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-06-04 | 1971-12-04 | 1972-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-04 | 1975-12-04 | 1976-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-04 | 1979-12-04 | 1980-06-04 | $7700.00 | Window Closed / Lapsed |