Patent US2564992A successfully refreshed from Google Patents.
US2564992A
Expired / Lapsed
US
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Rubber reinforcing pigment
Assignee: PPG Industries Inc
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Filing: 1946-07-30
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Granted: 1951-08-21
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Expires: 1966-07-30
Abstract
No abstract record available.
Inventors
- 👤 Pechukas Alphonse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:00
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/28; C08; C08K; C08K9/00; C08K9/04; C01; C01P; C01P2004/00; C01P2004/60; C01P2004/62; C01P2004/80; C01P2006/00; C01P2006/60
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
35 words
FINELY DIVIDED HYDRATED CALCIUM SILICATE HAVING AN AVERAGE PARTICLE SIZE OF LESS THAN 1 MICRON AND HAVING ADSORBED THEREON A POLYHYDRIC ALCOHOL OF THE GROUP CONSISTING OF ETHYLENE GLYCOL, PROPYLENE GLYCOL, GLYCEROL, AND DIETHYLENE GLYCOL.
Claim 2
Dependent Claim
35 words
FINELY DIVIDED HYDRATED CALCIUM SILICATE HAVING AN AVERAGE PARTICLE SIZE OF LESS THAN 1 MICRON AND HAVING ADSORBED THEREON A POLYHYDRIC ALCOHOL OF THE GROUP CONSISTING OF ETHYLENE GLYCOL, PROPYLENE GLYCOL, GLYCEROL, AND DIETHYLENE GLYCOL.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-08-20 | 1955-02-19 | 1955-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-08-20 | 1959-02-19 | 1959-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-08-20 | 1963-02-19 | 1963-08-21 | $7700.00 | Window Closed / Lapsed |