US2655490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic hardening of phenol-formaldehyde resins and compositions comprising same
Assignee: Dow Chemical Co
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Filing: 1950-06-03
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Granted: 1953-10-13
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Expires: 1970-06-03
Abstract
No abstract record available.
Inventors
- 👤 Lawrence F Sonnabend
- 👤 Alvin M Edmunds
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:04
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/09; C08K5/095; C08K5/36; C08K5/41; C08K5/42
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
63 words
A COMPOSITION COMPRISING A LIQUID, WATERINSOLUBLE CONDENSATION PRODUCT OF PHENOL AND FORMALDEHDYE, WHICH CONDENSATION PRODUCT IS IN AMOUNT SUFFICIENT, WHEN HARDENED, TO SET THE ENTIRE COMPOSITION TO A RIGID, SOLID MASS, AND A MINOR AMOUNT OF A HARDENING AGENT CONSISTING ESSENTIALLY OF A MIXTURE OF TRICHLOROACETIC ACID AND BENZENE SULFONYL CHLORIDE CONTAINING FROM 33 TO 98 PER CENT BY WEIGHT OF THE LATTER.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-10-12 | 1957-04-13 | 1957-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-12 | 1961-04-13 | 1961-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-12 | 1965-04-13 | 1965-10-13 | $7700.00 | Window Closed / Lapsed |