US2421876A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolymer of styrene and a polyester of endomethylene tetrahydrophthalic acid and a glycol
Assignee: PPG Industries Inc
•
Filing: 1943-12-03
•
Granted: 1947-06-10
•
Expires: 1963-12-03
Abstract
No abstract record available.
Inventors
- 👤 Howard L Gerhart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:30
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/66; C08G63/668; C08G63/676; Y; Y10; Y10S; Y10S55/00; Y10S55/24
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1860730A
Cited
DE598732C
Cited
US2195362A
Cited
US2255313A
Cited
US2351019A
Cited
US2235447A
Cited
US2359038A
Cited
DE695756C
Cited
US2251297A
Cited
US2319780A
Cited
US2319826A
Cited
US2311260A
Cited
US2369689A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-06-09 | 1950-12-09 | 1951-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-06-09 | 1954-12-09 | 1955-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-06-09 | 1958-12-09 | 1959-06-10 | $7700.00 | Window Closed / Lapsed |