Patent US3120903A successfully refreshed from Google Patents.
Patent US2669098A successfully refreshed from Google Patents.
US3333940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process comprising impregnation of exfoliated vermiculite with urea-formaldehyde, and product thereof
Assignee: WR Grace and Co
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Filing: 1966-05-13
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Granted: 1967-08-01
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Expires: 1986-05-13
Abstract
No abstract record available.
Inventors
- 👤 John L Ridgeway
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:35
CPC Classifications
C; C05; C05C; C05C9/00; C05C9/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
33 words
A FERTILIZER COMPOSITION COMPRISING EXFOLIATED VERMICULITE, THE INTERNAL SURFACE OF THE PLATELETS OF THE VERMICULITE BEING IMPREGNATED AND BONDED WITH A UREAFORMALDEHYDE CONDENSATION POLYMER FORMED IN SITU, SAID COMPOSITION BEING IN GRANULAR FORM.
Claim 2
Dependent Claim
33 words
A FERTILIZER COMPOSITION COMPRISING EXFOLIATED VERMICULITE, THE INTERNAL SURFACE OF THE PLATELETS OF THE VERMICULITE BEING IMPREGNATED AND BONDED WITH A UREAFORMALDEHYDE CONDENSATION POLYMER FORMED IN SITU, SAID COMPOSITION BEING IN GRANULAR FORM.
Claim 3
Independent Claim
61 words
A METHOD OF PREPARING A FERTILIZER COMPOSITION COMPRISING MIXING AN AQUEOUS SOLUTION OF UREA AND FORMALDEHYDE WITH GRANULATED EXFOLIATED VERMICULITE WHEREBY INTIMATE PENETRATION OF THE VERMICULITE IS EFFECTED, ACIDIFYING THE RESULTING MIXTURE BY THE ADDTION OF AN ACID THERETO TO CATALYZE CONDENSATION OF SAID UREA AND FORMALDEHYDE IN SITU, AND THEN ADDING AMMONIA TO SAID MIXTURE TO SUBSTANTIALLY NEUTRALIZE SAID ACID.
Claim 4
Independent Claim
61 words
A METHOD OF PREPARING A FERTILIZER COMPOSITION COMPRISING MIXING AN AQUEOUS SOLUTION OF UREA AND FORMALDEHYDE WITH GRANULATED EXFOLIATED VERMICULITE WHEREBY INTIMATE PENETRATION OF THE VERMICULITE IS EFFECTED, ACIDIFYING THE RESULTING MIXTURE BY THE ADDTION OF AN ACID THERETO TO CATALYZE CONDENSATION OF SAID UREA AND FORMALDEHYDE IN SITU, AND THEN ADDING AMMONIA TO SAID MIXTURE TO SUBSTANTIALLY NEUTRALIZE SAID ACID.
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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) | 1970-07-31 | 1971-01-30 | 1971-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-31 | 1975-01-30 | 1975-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-31 | 1979-01-30 | 1979-08-01 | $7700.00 | Window Closed / Lapsed |