Patent US3533908A successfully refreshed from Google Patents.
US3533908A
Expired / Lapsed
US
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Porous paperboard sheet having plastic microspheres therein
Assignee: Fort James Corp
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Filing: 1967-05-19
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Granted: 1970-10-13
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Expires: 1987-05-19
Abstract
No abstract record available.
Inventors
- 👤 Harold M Hoogsteen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:50
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/34; D21H17/37; D21H17/35; D21H21/00; D21H21/14; D21H21/22; D21H21/50; D21H21/52; D21H21/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3157566A
Cited
US3293114A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-12 | 1974-04-13 | 1974-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-12 | 1978-04-13 | 1978-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-12 | 1982-04-13 | 1982-10-13 | $7700.00 | Window Closed / Lapsed |