Patent US3248255A successfully refreshed from Google Patents.
US3248255A
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Particulate urea coated with ureaformaldehyde and process of making same
Assignee: EIDP Inc
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Filing: 1961-10-24
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Granted: 1966-04-26
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Expires: 1981-10-24
Abstract
No abstract record available.
Inventors
- 👤 Irvin J Belasco
- 👤 Robert J Church
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:54
CPC Classifications
C; C08; C08G; C08G12/00; C08G12/02; C08G12/04; C08G12/10; C08G12/12; A; A23; A23K; A23K50/00; A23K50/10; A23K50/15; C05; C05C; C05C9/00; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
18 words
PARTICULATE UREA BEARING A CONTINUOUS COATING OF UREA-FORMALDEHYDE POLYMER, SAID COATING BEING 0.01 MICRON THROUGH 1 MILLIMETER THICK.
Claim 2
Dependent Claim
73 words
A PROCESS FOR THE PREPARATION OF PARTICULATE UREA BEARING A CONTINUOUS COATING JOF UREA-FORMALDEHYDE POLYMER, SAID PROCESS COMPRISING RAACTING AT A TEMPERATURE OF FROM 40*C. TO 70*C. PARTICULATE UREA WITH DRY GASEOUS FORMALDEHYDE IN THE PRESENCE OF AN ACIDIC CATALYST AND IN THE PRESENCE OF NO MORE THAN ABOUT 5% BY WEIGHT OF WATER BASED ON THE TOTAL WEIGHT OF THE REACTION MASS UNTIL SAID COATING IS 0.01 MICRON THROUGH 1 MILLIMETER THICK.
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) | 1969-04-25 | 1969-10-25 | 1970-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-25 | 1973-10-25 | 1974-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-25 | 1977-10-25 | 1978-04-26 | $7700.00 | Window Closed / Lapsed |