Patent US2818432A successfully refreshed from Google Patents.
US2818432A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of 2, 2'-dihydroxy-1, 1'-aldazines of the benzene and naphthalene series
Assignee: GAF Chemicals Corp
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Filing: 1954-12-01
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Granted: 1957-12-31
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Expires: 1974-12-01
Abstract
No abstract record available.
Inventors
- 👤 Jr Ben H Kirby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:47
CPC Classifications
C; C07; C07C; C07C251/00; C07C251/72; C07C251/88
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
20 words
A PROCESS COMPRISING CONDENSING AT A TEMPERATURE OF ABOUT 10 TO 60*C. 2 MOLES OF AN ALDEHYDE OF THE FORMULA
Claim 2
Dependent Claim
20 words
A PROCESS COMPRISING CONDENSING AT A TEMPERATURE OF ABOUT 10 TO 60*C. 2 MOLES OF AN ALDEHYDE OF THE FORMULA
References Cited (Backward Citations)
DE92470C
Cited
US483290A
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US2305379A
Cited
US2445518A
Cited
US2358893A
Cited
US2440070A
Cited
US2464128A
Cited
US2691642A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-30 | 1961-07-01 | 1961-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-30 | 1965-07-01 | 1965-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-30 | 1969-07-01 | 1969-12-31 | $7700.00 | Window Closed / Lapsed |