US2928812A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydroxyalkyl carbamate-formaldehyde condensation products
Assignee: Individual
•
Filing: 1953-10-02
•
Granted: 1960-03-15
•
Expires: 1973-10-02
Abstract
No abstract record available.
Inventors
- 👤 Erust Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:44
CPC Classifications
C; C08; C08G; C08G12/00; C08G12/02; C08G12/04; C08G12/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
A PROCESS FOR FORMING A CONDENSATION PRODUCT OF FORMALDEHYDE, A UREA, AND ALKANOL CARBAMATES, WHICH COMPRISES HEATING TO AN ELEVATED TEMPERATURE A MIXTURE OF FORMALDEHYDE, A MEMBER CHOSEN FROM THE GROUP CONSISTING OF UREA, MONOMETHYLOL UREA, DIMETHYLOL UREA, ACETYLENEDIUREIN AND METHYLOL DERIVATES THEREOF, AND AN ALKANOL CARBAMATE HAVING THE CONSTITUTIONAL FORMULA
Claim 2
Dependent Claim
51 words
A PROCESS FOR FORMING A CONDENSATION PRODUCT OF FORMALDEHYDE, A UREA, AND ALKANOL CARBAMATES, WHICH COMPRISES HEATING TO AN ELEVATED TEMPERATURE A MIXTURE OF FORMALDEHYDE, A MEMBER CHOSEN FROM THE GROUP CONSISTING OF UREA, MONOMETHYLOL UREA, DIMETHYLOL UREA, ACETYLENEDIUREIN AND METHYLOL DERIVATES THEREOF, AND AN ALKANOL CARBAMATE HAVING THE CONSTITUTIONAL FORMULA
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) | 1963-03-15 | 1963-09-14 | 1964-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-15 | 1967-09-14 | 1968-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-15 | 1971-09-14 | 1972-03-15 | $7700.00 | Window Closed / Lapsed |