Patent US2839494A successfully refreshed from Google Patents.
US2839494A
Expired / Lapsed
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Resinous condensation products and their production
Assignee: Hoechst AG Werk Kalle Albert
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Filing: 1955-03-24
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Granted: 1958-06-17
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Expires: 1975-03-24
Abstract
No abstract record available.
Inventors
- 👤 Reese Johannes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:03
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/02; C08G59/04; C08G59/06; C08G59/063
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
23 words
A PROCESS FOR THE PREPARATION OF RESINOUS CONDENSATION PRODUCTS WHICH COMPRISES MIXING AND REACTING IN AN ALKALINE MEDIUM A DIPHENOL HAVING THE FORMULA:
Claim 2
Dependent Claim
23 words
A PROCESS FOR THE PREPARATION OF RESINOUS CONDENSATION PRODUCTS WHICH COMPRISES MIXING AND REACTING IN AN ALKALINE MEDIUM A DIPHENOL HAVING THE FORMULA:
References Cited (Backward Citations)
US2444594A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-16 | 1961-12-16 | 1962-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-16 | 1965-12-16 | 1966-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-16 | 1969-12-16 | 1970-06-17 | $7700.00 | Window Closed / Lapsed |