Patent US2163161A successfully refreshed from Google Patents.
US3433703A
Expired / Lapsed
US
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Method of forming paper from synthetic fibers having a skeletal structure
Assignee: 3M Co
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Filing: 1967-11-21
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Granted: 1969-03-18
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Expires: 1987-11-21
Abstract
No abstract record available.
Inventors
- 👤 Richard G Riedesel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:49
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/28; D01D5/30; D01D5/36; D21; D21H; D21H5/00; D21H5/12; D21H5/20
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) | 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 |