US3131076A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making cellulose sponge
Assignee: Akzo Nobel UK PLC
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Filing: 1961-05-04
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Granted: 1964-04-28
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Expires: 1981-05-04
Abstract
No abstract record available.
Inventors
- 👤 William C Richardson
- 👤 Richard J Bohnhoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:42
CPC Classifications
C; C08; C08J; C08J9/00; C08J2301/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-04-28 | 1967-10-28 | 1968-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-28 | 1971-10-28 | 1972-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-28 | 1975-10-28 | 1976-04-28 | $7700.00 | Window Closed / Lapsed |