US3778302A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Certain permeable materials impregnated with a polyurethane polymer
Assignee: Continental Tapes Inc
•
Filing: 1972-03-16
•
Granted: 1973-12-11
•
Expires: 1992-03-16
Abstract
Abstract PERMEABLE MATERIALS CONTAINING "ACTIVE" HYDROGEN, SUCH AS PAPER, ARE MARKEDLY IMPROVED IN DRY AND WET TENSILE STRENGTHS AND DELAMINATION RESISTANCE WITHOUT LOSS OF FLEXIBILITY, BY IMPREGNATION WITH CERTAIN POLYURETHANE POLYMERS.
Inventors
- 👤 R Dahl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:22
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/54; D21H17/57; C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G18/16; C08G18/22; C08G18/24; C08G18/244; C08G18/28; C08G18/40; C08G18/64; Y; Y10; Y10T; Y10T428/00; Y10T428/28; Y10T428/31504; Y10T428/31551; Y10T428/31591; Y10T428/31971; Y10T428/31993; Y10T428/31996
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) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |