US3255031A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making roofing granules and product thereof
Assignee: 3M Co
•
Filing: 1962-07-30
•
Granted: 1966-06-07
•
Expires: 1982-07-30
Abstract
No abstract record available.
Inventors
- 👤 James R Lodge
- 👤 Robert H Fehner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:49
CPC Classifications
E; E04; E04D; E04D7/00; E04D7/005; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24355; Y10T428/24372; Y10T428/2438; Y10T428/24388; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2998
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
71 words
A PROCESS FOR PREPARING ARTIFICIALLY COLOR-COATED GRANULES COMPRISING COATING RAW MINERAL GRANULES WITH AN AQUEOUS PIGMENTED ALKALI SILICATE COMPOSITION CONTAINING THEREIN A CLAY THAT IS HEAT REACTIVE WITH THE ALKALI SILICATE AND AN OXYGEN CONTAINING BORON COMPOUND THAT IS SUBSTANTIALLY NON-GELLING WITH THE ALKALI SILICATE FOR SECURE BONDING OF THE COMPOSITION TO THE RAW MINERAL GRANULES, AND INSOLUBILIZING SAID COATING BY FIRING SAID COATED GRANULES TO A TEMPERATURE BELOW ABOUT 950*F.
Claim 2
Dependent Claim
71 words
A PROCESS FOR PREPARING ARTIFICIALLY COLOR-COATED GRANULES COMPRISING COATING RAW MINERAL GRANULES WITH AN AQUEOUS PIGMENTED ALKALI SILICATE COMPOSITION CONTAINING THEREIN A CLAY THAT IS HEAT REACTIVE WITH THE ALKALI SILICATE AND AN OXYGEN CONTAINING BORON COMPOUND THAT IS SUBSTANTIALLY NON-GELLING WITH THE ALKALI SILICATE FOR SECURE BONDING OF THE COMPOSITION TO THE RAW MINERAL GRANULES, AND INSOLUBILIZING SAID COATING BY FIRING SAID COATED GRANULES TO A TEMPERATURE BELOW ABOUT 950*F.
References Cited (Backward Citations)
US1944800A
Cited
US2081609A
Cited
US2163678A
Cited
US2298277A
Cited
US2331358A
Cited
US2553604A
Cited
US2927045A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-06-06 | 1969-12-06 | 1970-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-06 | 1973-12-06 | 1974-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-06 | 1977-12-06 | 1978-06-07 | $7700.00 | Window Closed / Lapsed |