US4357457A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Useful solutions of the tetramethylol derivative of 4,4'iso-propylidenediphenol
Assignee: Armstrong World Industries Inc
•
Filing: 1982-01-13
•
Granted: 1982-11-02
•
Expires: 2002-01-13
Abstract
Abstract The tetramethylol derivative of 4,4'iso-propylidenediphenol is dissolved in a solution of water and ethylene or propylene carbonate to yield concentrated solutions of the derivative in a form which may readily be used in the manufacture of foams or used as a liquid binder for molded ceiling products. Based on 100 parts by weight of the tetramethylol derivative, these solutions contain from about 15 to about 35 parts by weight of water and from about 5 to about 30 parts by weight of ethylene carbonate or propylene carbonate, with the total parts by weight of the water and carbonate varying from about 40 to about 45.
Inventors
- 👤 Thomas G. Harris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:15
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/14; C08J9/143; C07; C07C; C07C39/00; C07C39/12; C08J2361/00; C08J2361/04; C08J2361/06
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
57 words
A solution comprising, in relative proportions, 100 parts by weight of the tetramethylol derivative of 4,4'iso-propylidenediphenol, about 15 to about 35 parts by weight water and about 5 to about 30 parts by weight of ethylene carbonate or propylene carbonate, with the total parts by weight of water and carbonate ranging from about 40 to about 45.
Claim 2
Dependent Claim
57 words
A solution comprising, in relative proportions, 100 parts by weight of the tetramethylol derivative of 4,4'iso-propylidenediphenol, about 15 to about 35 parts by weight water and about 5 to about 30 parts by weight of ethylene carbonate or propylene carbonate, with the total parts by weight of water and carbonate ranging from about 40 to about 45.
Claim 3
Dependent Claim
12 words
The solution of claim 1 wherein the carbonate used is ethylene carbonate.
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) | 1985-11-01 | 1986-05-03 | 1986-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-01 | 1990-05-03 | 1990-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-01 | 1994-05-03 | 1994-11-02 | $7700.00 | Window Closed / Lapsed |