US2758038A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of making artificially colored mineral granules
Assignee: Patent and Licensing Corp
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Filing: 1953-10-28
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Granted: 1956-08-07
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Expires: 1973-10-28
Abstract
No abstract record available.
Inventors
- 👤 Lentz Alfred Paul
- 👤 Samuel T Rudish
- 👤 Szabo Andrew
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:14
CPC Classifications
E; E04; E04D; E04D7/00; E04D7/005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
THE PROCESS OF PRODUCING ARTIFICIALLY COLORED MINERAL GRANULES, WHICH COMPRISES APPLYING TO THE SURFACES OF THE GRANULES A COATING COMPOSITION COMPRISING PIGMENT, A WATER-SOLUBLE HYDRATE OF A SILICATE AND POWDERED, ANHYDROUS ALKALI METAL SILICATE HAVING A SOLUBILITY RATE OF LESS THAN 20% IN FIFTEEN MINUTES FOR A 10 MESH SAMPLE, THE ANHYDROUS SILICATE BEING PRESENT IN AN AMOUNT OF BETWEEN APPROXIMATELY 15 AND 50 PERCENT BY WEIGHT OF THE SOLIDS CONTENT OF THE WATER-SOLUBLE SILICATE, AND SUBJECTING THE THUS COATED GRANULES TO HEAT TREATMENT AT TEMPERATURES WITHIN THE RANGE OF APPROXIMATELY 400* TO 1800* F., WHEREBY TO INSOLUBILIZE THE COATING AND PRODUCE A COLOR FILM THEREON CHARACTERIZED BY SUBSTANTIAL RESISTANCE TO STAINING BY BITUMEN OR CONSTITUENTS THEREOF.
Claim 2
Dependent Claim
117 words
THE PROCESS OF PRODUCING ARTIFICIALLY COLORED MINERAL GRANULES, WHICH COMPRISES APPLYING TO THE SURFACES OF THE GRANULES A COATING COMPOSITION COMPRISING PIGMENT, A WATER-SOLUBLE HYDRATE OF A SILICATE AND POWDERED, ANHYDROUS ALKALI METAL SILICATE HAVING A SOLUBILITY RATE OF LESS THAN 20% IN FIFTEEN MINUTES FOR A 10 MESH SAMPLE, THE ANHYDROUS SILICATE BEING PRESENT IN AN AMOUNT OF BETWEEN APPROXIMATELY 15 AND 50 PERCENT BY WEIGHT OF THE SOLIDS CONTENT OF THE WATER-SOLUBLE SILICATE, AND SUBJECTING THE THUS COATED GRANULES TO HEAT TREATMENT AT TEMPERATURES WITHIN THE RANGE OF APPROXIMATELY 400* TO 1800* F., WHEREBY TO INSOLUBILIZE THE COATING AND PRODUCE A COLOR FILM THEREON CHARACTERIZED BY SUBSTANTIAL RESISTANCE TO STAINING BY BITUMEN OR CONSTITUENTS THEREOF.
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) | 1959-08-07 | 1960-02-06 | 1960-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-08-07 | 1964-02-06 | 1964-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-08-07 | 1968-02-06 | 1968-08-07 | $7700.00 | Window Closed / Lapsed |