Patent DE1294078B successfully refreshed from Google Patents.
US3208871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making stain-resistant roofing granules, and product thereof
Assignee: 3M Co
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Filing: 1962-07-30
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Granted: 1965-09-28
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Expires: 1982-07-30
Abstract
No abstract record available.
Inventors
- 👤 Axel O Langseth
- 👤 James R Lodge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:53
CPC Classifications
E; E04; E04D; E04D7/00; E04D7/005; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24355; Y10T428/24372; Y10T428/2438; Y10T428/24388; Y10T428/249921; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2995
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
A PROCESS FOR PREPARING HIGHLY STAIN-RESISTANT ARTIFICIALLY COLOR-COATED GRANULES, SAID PROCESS COMPRISING COATING RAW MINERAL GRANULES WITH A FIRST AQUEOUS PIGMENTED ALKALI, SILICATE COATING COMPOSITION, INSOLUBLIZING SAID FIRST COATING, COATING THE RESULTING PRECOATED GRANULES WITH A SECOND DIFFERENTLY CONSTITUTED PIGMENTED ALKALI SILICATE COATING COMPOSITION, AND INSOLUBLIZING SAID SECOND COATING, THE COMPOSITIONS OF THE RESPECTIVE COATINGS YIELDING A POROSITY IN SAID PRECOATING WHICH IS SUBSTANTIALLY GREATER THAN THE POROSITY OF SAID SECOND COATING WHERE THE LATTER IS COATED ALONE ON RAW MINERAL GRANULES AND INSOLUBLIZED.
Claim 2
Dependent Claim
84 words
A PROCESS FOR PREPARING HIGHLY STAIN-RESISTANT ARTIFICIALLY COLOR-COATED GRANULES, SAID PROCESS COMPRISING COATING RAW MINERAL GRANULES WITH A FIRST AQUEOUS PIGMENTED ALKALI, SILICATE COATING COMPOSITION, INSOLUBLIZING SAID FIRST COATING, COATING THE RESULTING PRECOATED GRANULES WITH A SECOND DIFFERENTLY CONSTITUTED PIGMENTED ALKALI SILICATE COATING COMPOSITION, AND INSOLUBLIZING SAID SECOND COATING, THE COMPOSITIONS OF THE RESPECTIVE COATINGS YIELDING A POROSITY IN SAID PRECOATING WHICH IS SUBSTANTIALLY GREATER THAN THE POROSITY OF SAID SECOND COATING WHERE THE LATTER IS COATED ALONE ON RAW MINERAL GRANULES AND INSOLUBLIZED.
References Cited (Backward Citations)
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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) | 1968-09-27 | 1969-03-29 | 1969-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-27 | 1973-03-29 | 1973-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-27 | 1977-03-29 | 1977-09-28 | $7700.00 | Window Closed / Lapsed |