Patent US3945270A successfully refreshed from Google Patents.
Patent US3323898A successfully refreshed from Google Patents.
US3323898A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Controlled solubility micronutrient-containing soil amendment material comprising expanded perlite
Assignee: Individual
•
Filing: 1965-03-08
•
Granted: 1967-06-06
•
Expires: 1985-03-08
Abstract
No abstract record available.
Inventors
- 👤 Pierce Harold Ladd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:44
CPC Classifications
A; A01; A01N; A01N25/00; A01N25/08; C; C05; C05G; C05G5/00; C05G5/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
AN ARTICLE OF MANUFACTURE FOR CONTROLLED RELEASE OF A PLANT MICRONUTRIENT WHEN EXPOSED TO SOIL MOISTURE DURING AGRICULTURAL USE THEREOF, COMPRISING; THIN-WALLED EXPANDED PERLITE PARTICLES HAVING AN IMPERFECT FRIT SINTERED OR FRITTED THEREON TO FORM A COATING, SAID IMPERFECT FRIT CONTAINING BASE, NEUTRAL AND ACID OXIDE INGREDIENTS OF A CONVENTIONAL CERAMIC GLAZE AND INCLUDING AT LEAST ONE MICRONUTRIENT, THE PROPORTIONS OF SAID INGREDIENTS BEING SUCH AS TO PROVIDE A FRIT WHICH IS MORE SOLUBLE THAN A CONVENTIONAL CERAMIC GLAZE AND WHICH, UPON EXPOSURE TO SOIL MOISTURE, WILL RELEASE SAID MICRONUTRIENT AT A CONTROLLED RATE.
Claim 2
Dependent Claim
94 words
AN ARTICLE OF MANUFACTURE FOR CONTROLLED RELEASE OF A PLANT MICRONUTRIENT WHEN EXPOSED TO SOIL MOISTURE DURING AGRICULTURAL USE THEREOF, COMPRISING; THIN-WALLED EXPANDED PERLITE PARTICLES HAVING AN IMPERFECT FRIT SINTERED OR FRITTED THEREON TO FORM A COATING, SAID IMPERFECT FRIT CONTAINING BASE, NEUTRAL AND ACID OXIDE INGREDIENTS OF A CONVENTIONAL CERAMIC GLAZE AND INCLUDING AT LEAST ONE MICRONUTRIENT, THE PROPORTIONS OF SAID INGREDIENTS BEING SUCH AS TO PROVIDE A FRIT WHICH IS MORE SOLUBLE THAN A CONVENTIONAL CERAMIC GLAZE AND WHICH, UPON EXPOSURE TO SOIL MOISTURE, WILL RELEASE SAID MICRONUTRIENT AT A CONTROLLED RATE.
References Cited (Backward Citations)
US2732290A
Cited
US2498480A
Cited
US2779670A
Cited
US2806773A
Cited
US2904424A
Cited
US2909869A
Cited
US2902972A
Cited
US3174845A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-06-05 | 1970-12-05 | 1971-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-06-05 | 1974-12-05 | 1975-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-06-05 | 1978-12-05 | 1979-06-06 | $7700.00 | Window Closed / Lapsed |