US3336337A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chromogenous tetrakis(aminophenyl) derivatives of benzodifuran
Assignee: Unisys Corp
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Filing: 1961-08-31
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Granted: 1967-08-15
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Expires: 1981-08-31
Abstract
No abstract record available.
Inventors
- 👤 Earl J Gosnell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:02
CPC Classifications
G; G09; G09B; G09B3/00; G09B3/02; G09B3/04; B; B41; B41M; B41M5/00; B41M5/124; B41M5/132; B41M5/136; C; C07; C07D; C07D493/00; C07D493/02; C07D493/04; C09; C09B; C09B11/00; C09B11/04; C09B11/10; C09B11/24; Y; Y10; Y10S; Y10S204/00; Y10S204/901
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
19 words
A CHROMOGENOUS COMPOUND SELECTED FORM THE GROUP CONSISTING OF (A) A T ETRAARYL-SUBSTITUTED COMPOUND BASED ON THE STRUCTURAL FORMULA
Claim 2
Dependent Claim
19 words
A CHROMOGENOUS COMPOUND SELECTED FORM THE GROUP CONSISTING OF (A) A T ETRAARYL-SUBSTITUTED COMPOUND BASED ON THE STRUCTURAL FORMULA
References Cited (Backward Citations)
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Cited
US2554543A
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US2935938A
Cited
US3012042A
Cited
US2870040A
Cited
US2940983A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-08-14 | 1971-02-13 | 1971-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-08-14 | 1975-02-13 | 1975-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-08-14 | 1979-02-13 | 1979-08-15 | $7700.00 | Window Closed / Lapsed |