Patent US2873181A successfully refreshed from Google Patents.
US2873181A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated abrasive article and method of making
Assignee: Unifrax I LLC
•
Filing: 1954-09-01
•
Granted: 1959-02-10
•
Expires: 1974-09-01
Abstract
No abstract record available.
Inventors
- 👤 Carlton M Hanford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:11
CPC Classifications
B; B24; B24D; B24D11/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
A COATED ABRASIVE ARTICLE COMPRISING A BACKING HAVING A LAYER OF ABRASIVE GRAIN ATTACHED TO A SURFACE THEREOF BY A BOND CONSISTING ESSENTIALLY OF (A) A MATERIAL SELECTED FROM THE GROUP CONSISTING OF ANIMAL GLUE AND A HEAT HARDENED SYNTHETIC RESIN SELECTED FROM THE GROUP CONSISTING OF PHENOL-FORMALDEHYDE, UREA-FORMALDEHYDE AND MELAMINE-FORMALDEHYDE RESINS, AND (B) A SUBSTANTIAL AMOUNT OF WOLLASTONITE; THE PARTICLES OF SAID WOLLASTONITE BEING OF SUCH SIZE AND SHAPE THAT AT LEAST ABOUT 80% WILL PASS THROUGH A 325 MESH SCREEM AND AT LEAST ABOUT 70% OF THE PARTICLES BY COUNT SHALL BE LESS THAN 4 MICRONS IN LENGTH, THE PARTICLES HAVING A LENGTH GREATER THAN 4 MICRONS HAVING AN AVERAGE RATIO OF LENGTH TO DIAMETER OF AT LEAST 3:1 AND AN AVERAGE DIAMETER WITHIN THE RANGE OF ABOUT 4-8 MICRONS.
Claim 2
Dependent Claim
132 words
A COATED ABRASIVE ARTICLE COMPRISING A BACKING HAVING A LAYER OF ABRASIVE GRAIN ATTACHED TO A SURFACE THEREOF BY A BOND CONSISTING ESSENTIALLY OF (A) A MATERIAL SELECTED FROM THE GROUP CONSISTING OF ANIMAL GLUE AND A HEAT HARDENED SYNTHETIC RESIN SELECTED FROM THE GROUP CONSISTING OF PHENOL-FORMALDEHYDE, UREA-FORMALDEHYDE AND MELAMINE-FORMALDEHYDE RESINS, AND (B) A SUBSTANTIAL AMOUNT OF WOLLASTONITE; THE PARTICLES OF SAID WOLLASTONITE BEING OF SUCH SIZE AND SHAPE THAT AT LEAST ABOUT 80% WILL PASS THROUGH A 325 MESH SCREEM AND AT LEAST ABOUT 70% OF THE PARTICLES BY COUNT SHALL BE LESS THAN 4 MICRONS IN LENGTH, THE PARTICLES HAVING A LENGTH GREATER THAN 4 MICRONS HAVING AN AVERAGE RATIO OF LENGTH TO DIAMETER OF AT LEAST 3:1 AND AN AVERAGE DIAMETER WITHIN THE RANGE OF ABOUT 4-8 MICRONS.
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) | 1962-02-09 | 1962-08-11 | 1963-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-09 | 1966-08-11 | 1967-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-09 | 1970-08-11 | 1971-02-10 | $7700.00 | Window Closed / Lapsed |