Patent US3720642A successfully refreshed from Google Patents.
US3720642A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Use of modified resins as binding agents for mineral substances
Assignee: Dynamit Nobel AG
•
Filing: 1970-10-09
•
Granted: 1973-03-13
•
Expires: 1990-10-09
Abstract
Abstract Improvements in the strength and other characteristics of sand filled resin, particularly phenolic resin bodies by incorporating epoxy silanes of the formula: WHEREIN M IS 2 OR 3, R and R'' are 1 to 4 carbon alkyls, and R'''' is a 1 to 8 carbon alkylene or alkylene ether in with such resin.
Inventors
- 👤 H Junger
- 👤 H Kotzsch
- 👤 H Vahlensieck
- 👤 F Weissenfels
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:41
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/54; C08K5/541; C08K5/5435
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
64 words
A shaped article of sand, the bonding agent for said sand being selected from the group consisting of phenol-aldehyde, furfurol-aldehyde and urea-aldehyde and including an epoxy silane modifying agent of the formula: wherein m is 2 or 3 R and R'' are each alkyl of 1 to 4 carbon atoms and R'''' is alkylene or alkylene ether of 1 to 8 atoms of carbon.
Claim 2
Dependent Claim
64 words
A shaped article of sand, the bonding agent for said sand being selected from the group consisting of phenol-aldehyde, furfurol-aldehyde and urea-aldehyde and including an epoxy silane modifying agent of the formula: wherein m is 2 or 3 R and R'' are each alkyl of 1 to 4 carbon atoms and R'''' is alkylene or alkylene ether of 1 to 8 atoms of carbon.
Claim 3
Dependent Claim
24 words
A shaped article as claimed in claim 1 wherein said modifying agent is present in a proportion of about 0.01 to 20 weight percent.
References Cited (Backward Citations)
US3234159A
Cited
US3297086A
Cited
US3419517A
Cited
US3331885A
Cited
US3403721A
Cited
US3409579A
Cited
US3546157A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-12 | 1976-09-11 | 1977-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-12 | 1980-09-11 | 1981-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-12 | 1984-09-11 | 1985-03-13 | $7700.00 | Window Closed / Lapsed |