US2838410A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods and compositions for improving clay products
Assignee: Spencer Chemical Co
•
Filing: 1955-10-27
•
Granted: 1958-06-10
•
Expires: 1975-10-27
Abstract
No abstract record available.
Inventors
- 👤 William C Francis
- 👤 Forrest L Turbett
- 👤 Leo C D Groenweghe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:04
CPC Classifications
C; C04; C04B; C04B33/00; C04B33/02; C04B33/13; C04B33/131
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
THE METHOD OF MANUFACTURING IMPROVED KILN-FIRED CLAY PRODUCTS WHICH COMPRISES: ADDING TO THE CLAY MIX FROM WHICH THE CLAY PRODUCTS ARE MADE A SMALL AMOUNT OF AN ADDITIVE COMBINATION CONSISTING ESSENTIALLY OF (A) FROM AT LEAST ABOUT .02% BY WEIGHT (BASED ON DRY CLAY) OF A NUMBER OF THE GROUP CONSISTING OF AMMONIUM NITRATE, AMMONIUM SULFATE, AMMONIUM CHLORIDE, AMMONIUM PHOSPHATE AND MIXTURES THEREOF, AND (B) FROM AT LEAST ABOUT .002% BY WEIGHT (BASED ON DRY CLAY) OF A MEMBER OF THE GROUP CONSISTING OF AMMONIA, AMMONIUM BICARBONATE AND MIXTURES THEREOF, SAID ADDITIVE COMBINATION BEING ADDED IN AN AMOUNT EQUAL TO AT LEAST BOUT 0.% BY WEIGHT (BASED ON DRY CLAY) OF THE CLAY MIX, FORMING CLAY PRODUCTS FROM SUCH ADMIXTURE, AND FIRING THE CLAY PRODUCTS.
Claim 2
Independent Claim
125 words
THE METHOD OF MANUFACTURING IMPROVED KILN-FIRED CLAY PRODUCTS WHICH COMPRISES: ADDING TO THE CLAY MIX FROM WHICH THE CLAY PRODUCTS ARE MADE A SMALL AMOUNT OF AN ADDITIVE COMBINATION CONSISTING ESSENTIALLY OF (A) FROM AT LEAST ABOUT .02% BY WEIGHT (BASED ON DRY CLAY) OF A NUMBER OF THE GROUP CONSISTING OF AMMONIUM NITRATE, AMMONIUM SULFATE, AMMONIUM CHLORIDE, AMMONIUM PHOSPHATE AND MIXTURES THEREOF, AND (B) FROM AT LEAST ABOUT .002% BY WEIGHT (BASED ON DRY CLAY) OF A MEMBER OF THE GROUP CONSISTING OF AMMONIA, AMMONIUM BICARBONATE AND MIXTURES THEREOF, SAID ADDITIVE COMBINATION BEING ADDED IN AN AMOUNT EQUAL TO AT LEAST BOUT 0.% BY WEIGHT (BASED ON DRY CLAY) OF THE CLAY MIX, FORMING CLAY PRODUCTS FROM SUCH ADMIXTURE, AND FIRING THE CLAY PRODUCTS.
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) | 1961-06-09 | 1961-12-09 | 1962-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-09 | 1965-12-09 | 1966-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-09 | 1969-12-09 | 1970-06-10 | $7700.00 | Window Closed / Lapsed |