Patent US3812146A successfully refreshed from Google Patents.
US3812146A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phthalide
Assignee: Takenaka Corp
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Filing: 1972-05-12
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Granted: 1974-05-21
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Expires: 1992-05-12
Abstract
Abstract THE PHTHALIDE, 3 - (1 -ETHYL-2-METHYLINDOL-3-YL)-3-(1BENZYL-2-METHYLLINDOL-3-YL) PHTHALIDE, IS DISCLOSED. THIS PHTHALIDE IS REPRESENTED BY THE STRUCTURE: 3-(1-(C2H5-),2-CH3-INDOL-3-YL),3-(1-(PHENYL-CH2-),2-CH3- INDOL-3-YL)PHTHALAN-1-ONE THIS COMPOUND IS USED IN PRESSURE-SENSITIVE RECORD MATERIAL AND IN MARK-FORMING MANIFOLD SYSTEMS.
Inventors
- 👤 S Farber
- 👤 A Wright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:08
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/124; B41M5/132; B41M5/136; B41M5/145
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-20 | 1977-11-19 | 1978-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-20 | 1981-11-19 | 1982-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-20 | 1985-11-19 | 1986-05-21 | $7700.00 | Window Closed / Lapsed |