US2501666A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lignin resins and process of making same
Assignee: Masonite Corp
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Filing: 1946-08-29
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Granted: 1950-03-28
•
Expires: 1966-08-29
Abstract
No abstract record available.
Inventors
- 👤 Raymond N Evans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:21
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/18; C08G16/00; C08G16/02; C08G16/0293; C08G2/20; C08G6/00; C08G6/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
A RESINOUS PRODUCT WHICH COMPRISES THE HEAT REACTION PRODUCT UNDER ACID CONDITIONS OF LIGNIN, FORMALDEHYDE AND A CONDENSATION PRODUCT OF FURFURAL AND ACETONE, SAID LIGNIN BEING PRESENT IN AN AMOUNT EQUAL TO 10% TO 60% BASED ON THE WEIGHT OF THE FURFRONT-ACETONE CONDENSATION PRODUCT AND THE MOLAL RATIO OF FORMALDEHYDE TO THE FURFURAL-ACETONE CONDENSATION PRODUCT BEING ABOUT 1 TO 1.
Claim 2
Dependent Claim
60 words
A RESINOUS PRODUCT WHICH COMPRISES THE HEAT REACTION PRODUCT UNDER ACID CONDITIONS OF LIGNIN, FORMALDEHYDE AND A CONDENSATION PRODUCT OF FURFURAL AND ACETONE, SAID LIGNIN BEING PRESENT IN AN AMOUNT EQUAL TO 10% TO 60% BASED ON THE WEIGHT OF THE FURFRONT-ACETONE CONDENSATION PRODUCT AND THE MOLAL RATIO OF FORMALDEHYDE TO THE FURFURAL-ACETONE CONDENSATION PRODUCT BEING ABOUT 1 TO 1.
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) | 1953-03-27 | 1953-09-26 | 1954-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-27 | 1957-09-26 | 1958-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-27 | 1961-09-26 | 1962-03-28 | $7700.00 | Window Closed / Lapsed |