Patent US2528398A successfully refreshed from Google Patents.
US2528398A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbamate esters
Assignee: PPG Industries Inc
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Filing: 1947-05-21
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Granted: 1950-10-31
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Expires: 1967-05-21
Abstract
No abstract record available.
Inventors
- 👤 Strain Franklin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:12
CPC Classifications
C; C07; C07C; C07C271/00; C07C271/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
A DI-ESTERAMIDE OF: (A) A SECONDARY HYDROCARBON MONOAMINE WHICH CONTAINS UP TO 18 CARBON ATOMS IN EACH HYDROCARBON GROUP AND (B) A POLYGLYCOL BIS (ACID CARBONATE) SAID GLYCOL CONTAINING 2 TO 6 GLYCOL UNITS, THE GLYCOL UNITS CONTAINING NO MORE THAN 6 CARBON ATOMS WHEREIN BOTH ACID GROUPS OF THE ACID CARBONATE (B) ARE AMIDATED WITH THE SECONDARY AMINE (A).
Claim 2
Dependent Claim
60 words
A DI-ESTERAMIDE OF: (A) A SECONDARY HYDROCARBON MONOAMINE WHICH CONTAINS UP TO 18 CARBON ATOMS IN EACH HYDROCARBON GROUP AND (B) A POLYGLYCOL BIS (ACID CARBONATE) SAID GLYCOL CONTAINING 2 TO 6 GLYCOL UNITS, THE GLYCOL UNITS CONTAINING NO MORE THAN 6 CARBON ATOMS WHEREIN BOTH ACID GROUPS OF THE ACID CARBONATE (B) ARE AMIDATED WITH THE SECONDARY AMINE (A).
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) | 1953-10-30 | 1954-05-01 | 1954-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-30 | 1958-05-01 | 1958-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-30 | 1962-05-01 | 1962-10-31 | $7700.00 | Window Closed / Lapsed |