US3770401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phosphate-bonded grinding wheel
Assignee: Northrop Grumman Systems Corp
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Filing: 1971-04-05
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Granted: 1973-11-06
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Expires: 1991-04-05
Abstract
Abstract An abrasive body of grit-size particles of alumina or silicon carbide held together by a water-insoluble aluminum phosphate bonding matrix, which body is of increased strength through its phosphate bonding matrix containing a small amount of at least one or both of particlate aluminum and an in-situ formed phosphosilicate; and an improved molding composition for preparing the abrasive body, which molding composition contains up to 12 percent by weight thereof of particulate aluminum of minus 200 mesh size and/or sodium silicate having a SiO2 to Na2O weight ratio greater than 1 and less than 3.8.
Inventors
- 👤 H Sheets
- 👤 R Meyer
- 👤 Hara M O
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:10
CPC Classifications
B; B24; B24D; B24D3/00; B24D3/02; B24D3/04; B24D3/14
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
14 words
The composition of claim 1 including the strength-promoting agent which is said particulate aluminum.
Claim 2
Dependent Claim
14 words
The composition of claim 1 including the strength-promoting agent which is said sodium silicate.
Claim 3
Dependent Claim
18 words
The composition of claim 1 including both said particulate aluminum and said sodium silicate as the strength-promoting agent.
Claim 4
Dependent Claim
155 words
An improved mixed cohesive molding composition for cold-pressing and subsequent heat-curing to become an article containing abrasive grit particles held together by a water-insoluble phosphate matrix, which composition for each 100 parts by weight thereof comprises: a. between 4 and 2.5 parts by weight of at least one strength-promoting agent selected from the group consisting of particulate aluminum of less than 200 mesh size and sodium silicate having a SiO2 to Na2O weight ratio between 2.0 and 3.3; b. from 62 to 78 parts by weight of abrasive-grit particles selected from the group consisting of alumina and silicon carbide; c. from 11 to 6 parts by weight of phosphoric acid whose free water content constitutes less than 3 percent by weight of the composition; d. from 25 to 15 parts by weight of -325 mesh alumina particles; and e. from 2 to 1 parts by weight of less than 3 micron size ferric oxide particles.
Claim 5
Dependent Claim
14 words
The composition of claim 5 including the strength-promoting agent which is said particulate aluminum.
Claim 6
Dependent Claim
14 words
The composition of claim 5 including the strength-promoting agent which is said sodium silicate.
Claim 7
Dependent Claim
18 words
The composition of claim 5 including both said particulate aluminum and said sodium silicate as the strength-promoting agent.
Claim 8
Dependent Claim
105 words
An abrasive body comprised of: a. abrasive grit particles selected from the group consisting of grit-size particles of alumina and silicon carbide in an amount constituting from 30 to 60 percent by volume of said body; held together by b. a water-insoluble phosphate bonding matrix constituting at least 8 percent by volume of said body, which water-insoluble bonding matrix consists essentially of aluminum phosphates and a minor amount of iron phosphates intermingled therewith and includes a minor amount up to 10 percent by volume of at least one or of both of particulate aluminum of less than 200 mesh size and an in-situ formed phospho-silicate.
Claim 9
Dependent Claim
10 words
The body of claim 9 which contains the particulate aluminum.
Claim 10
Dependent Claim
9 words
The body of claim 9 which contains the phospho-silicate.
Claim 11
Dependent Claim
14 words
The body of claim 9 which contains both the particulate aluminum and the phospho-silicate.
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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |