Patent US3244728A successfully refreshed from Google Patents.
US3244728A
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Chromogenous amino derivatives of diphenylphthalan and marking method using same
Assignee: Unisys Corp
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Filing: 1961-08-31
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Granted: 1966-04-05
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Expires: 1981-08-31
Abstract
No abstract record available.
Inventors
- 👤 John R Johnson
- 👤 Earl J Gosnell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:13
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/77; C07D307/87; B; B41; B41M; B41M5/00; B41M5/124; B41M5/132; B41M5/136; C09; C09B; C09B11/00; C09B11/04; C09B11/10; C09B11/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
19 words
A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF (A) THE COMPOUND 1, 1-BIS (P-AMINOPHENYL) PHTHALAN HAVING THE STRUCTURAL FORMULA
Claim 2
Dependent Claim
19 words
A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF (A) THE COMPOUND 1, 1-BIS (P-AMINOPHENYL) PHTHALAN HAVING THE STRUCTURAL FORMULA
References Cited (Backward Citations)
US2449088A
Cited
US2550468A
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US2554543A
Cited
US2935938A
Cited
US3012042A
Cited
US2940983A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-04-04 | 1969-10-04 | 1970-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-04 | 1973-10-04 | 1974-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-04 | 1977-10-04 | 1978-04-05 | $7700.00 | Window Closed / Lapsed |