Patent US3504072A successfully refreshed from Google Patents.
US3504072A
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US
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Method of preparing opaque sheet material
Assignee: Feldmuehle AG
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Filing: 1966-08-26
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Granted: 1970-03-31
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Expires: 1986-08-26
Abstract
No abstract record available.
Inventors
- 👤 Theodor Ploetz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:20
CPC Classifications
D; D21; D21H; D21H25/00; D21H25/02; B; B29; B29C; B29C48/00; B29C48/03; B29C48/07; B29C48/08; B29C48/25; B29C48/88; B29C48/91; B29C48/911; B29C48/9135; D21H17/00; D21H17/20; D21H17/33; D21H17/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2146295A
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US2874416A
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US2783894A
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US3020178A
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US3154605A
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US3212920A
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US3208875A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-30 | 1973-09-29 | 1974-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-30 | 1977-09-29 | 1978-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-30 | 1981-09-29 | 1982-03-31 | $7700.00 | Window Closed / Lapsed |