Patent US2816613A successfully refreshed from Google Patents.
Patent US4771671A successfully refreshed from Google Patents.
Patent US2435537A successfully refreshed from Google Patents.
US2435537A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyvinylidene fluoride and process for obtaining the same
Assignee: EIDP Inc
•
Filing: 1944-04-20
•
Granted: 1948-02-03
•
Expires: 1964-04-20
Abstract
No abstract record available.
Inventors
- 👤 Thomas A Ford
- 👤 Hanford William Edward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:31
CPC Classifications
C; C08; C08F; C08F14/00; C08F14/18; C08F14/22
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2183602A
Cited
FR796026A
Cited
US2334195A
Cited
US2328510A
Cited
US2362094A
Cited
US2362960A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-02-02 | 1951-08-04 | 1952-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-02-02 | 1955-08-04 | 1956-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-02-02 | 1959-08-04 | 1960-02-03 | $7700.00 | Window Closed / Lapsed |