Patent US3425992A successfully refreshed from Google Patents.
US3425992A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing formaldehyde copolymer having excellent dyeability
Assignee: Kuraray Co Ltd
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Filing: 1965-08-09
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Granted: 1969-02-04
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Expires: 1985-08-09
Abstract
No abstract record available.
Inventors
- 👤 Junnosuke Yamauchi
- 👤 Tamotsu Eguchi
- 👤 Kanji Matsubayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:32
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/10; C06; C06B; C06B43/00; C08G2/12; C08G2/14; C08G2/16; C08G2/18; C08G2/20; C08G2/22; C08G2/24; C08G2/30
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) | 1972-02-04 | 1972-08-05 | 1973-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-04 | 1976-08-05 | 1977-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-04 | 1980-08-05 | 1981-02-04 | $7700.00 | Window Closed / Lapsed |