US2447140A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of treating polyvinyl alcohol filaments and treated filament
Assignee: Johnson and Johnson
•
Filing: 1943-04-10
•
Granted: 1948-08-17
•
Expires: 1963-04-10
Abstract
No abstract record available.
Inventors
- 👤 Elbert M Shelton
- 👤 Thompson Walter Leland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:04
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/02; D01F6/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2316921A
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GB322157A
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US2146295A
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US2265283A
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US2138751A
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US2309370A
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US2346208A
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US2321746A
Cited
US2331955A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-08-17 | 1952-02-16 | 1952-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-08-17 | 1956-02-16 | 1956-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-08-17 | 1960-02-16 | 1960-08-17 | $7700.00 | Window Closed / Lapsed |