Patent US5531788A successfully refreshed from Google Patents.
US3400124A
Expired / Lapsed
US
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Optical brightening and new compositions of matter
Assignee: Mitsui Chemical Industry Co Ltd
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Filing: 1966-05-18
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Granted: 1968-09-03
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Expires: 1986-05-18
Abstract
No abstract record available.
Inventors
- 👤 Ichiro Okubo
- 👤 Michihiro Tsujimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:42
CPC Classifications
C; C07; C07D; C07D263/00; C07D263/52; C07D263/54; C07D263/56; C07D263/60; D; D06; D06L; D06L4/00; D06L4/60; D06L4/614; D06L4/636
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) | 1971-09-03 | 1972-03-04 | 1972-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-03 | 1976-03-04 | 1976-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-03 | 1980-03-04 | 1980-09-03 | $7700.00 | Window Closed / Lapsed |