Patent US3840485A successfully refreshed from Google Patents.
US3840485A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Furfural pitch composition
Assignee: Qo Chemicals Inc
•
Filing: 1971-09-10
•
Granted: 1974-10-08
•
Expires: 1991-09-10
Abstract
Abstract CH3--CO--R WHEREIN R IS HYDROCARBON GROUP HAVING BETWEEN 2 AND 4 CARBON ATOMS, INCLUSIVE. 1. A THERMOSETTING BINDER FOR REFRACTORY AGGREGATE CONSISTING ESSENTIALLY OF BETWEEN 50 AND 75 PERCENT BY WEIGHT OF COAL TAR PITCH HAVING A SOFTENING POINT ABOUT 100*C. AND BETWEEN 50 TO 25 PERCENT BY WEIGHT OF MONOMERIC POLYMERIZABLE THERMOSETTING DISPERSANTS CONSISTING OF FURFURAL AND A MEMBER SELECTED FROM THE GROUP CONSISTING OF PHENOL, CYCLOHEXANONE, AND COMPOUNDS HAVING THE FORMULA:
Inventors
- 👤 L Brown
- 👤 D Watson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:36
CPC Classifications
C; C04; C04B; C04B33/00; C04B33/02; C04B33/13; C04B33/1315; C04B35/00; C04B35/01; C04B35/013; C04B35/515; C04B35/52; C04B35/528; C04B35/532; C08; C08G; C08G16/00; C08G16/02; C08G16/0293; C08K; C08K5/00; C08K5/04; C08K5/07; C08K5/13; C08K5/15; C08K5/151; C08K5/1535
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
58 words
A THERMOSETTING BINDER FOR REFRACTORY AGGREGATE CONSISTING ESSENTIALLY OF BETWEEN 50 AND 75 PERCENT BY WEIGHT OF COAL TAR PITCH HAVING A SOFTENING POINT ABOUT 100*C. AND BETWEEN 50 TO 25 PERCENT BY WEIGHT OF MONOMERIC POLYMERIZABLE THERMOSETTING DISPERSANTS CONSISTING OF FURFURAL AND A MEMBER SELECTED FROM THE GROUP CONSISTING OF PHENOL, CYCLOHEXANONE, AND COMPOUNDS HAVING THE FORMULA:
Claim 2
Dependent Claim
58 words
A THERMOSETTING BINDER FOR REFRACTORY AGGREGATE CONSISTING ESSENTIALLY OF BETWEEN 50 AND 75 PERCENT BY WEIGHT OF COAL TAR PITCH HAVING A SOFTENING POINT ABOUT 100*C. AND BETWEEN 50 TO 25 PERCENT BY WEIGHT OF MONOMERIC POLYMERIZABLE THERMOSETTING DISPERSANTS CONSISTING OF FURFURAL AND A MEMBER SELECTED FROM THE GROUP CONSISTING OF PHENOL, CYCLOHEXANONE, AND COMPOUNDS HAVING THE FORMULA:
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-07 | 1978-04-08 | 1978-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-07 | 1982-04-08 | 1982-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-07 | 1986-04-08 | 1986-10-08 | $7700.00 | Window Closed / Lapsed |