US3433663A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impregnated porous paper webs and method of obtaining same
Assignee: Union Carbide Corp
•
Filing: 1964-05-04
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Granted: 1969-03-18
•
Expires: 1984-05-04
Abstract
No abstract record available.
Inventors
- 👤 William F Underwood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:35
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/21; D21H17/24; D21H17/25; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1303; Y10T428/1307
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1745557A
Cited
US1701543A
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US2033481A
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US2686725A
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US2910380A
Cited
US3135613A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-03-17 | 1972-09-16 | 1973-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-17 | 1976-09-16 | 1977-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-17 | 1980-09-16 | 1981-03-18 | $7700.00 | Window Closed / Lapsed |