Patent US2431784A successfully refreshed from Google Patents.
US2431784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Questionnaire recorder
Assignee: PRIVATE OPINIONS Inc
•
Filing: 1944-09-26
•
Granted: 1947-12-02
•
Expires: 1964-09-26
Abstract
No abstract record available.
Inventors
- 👤 White Pereival
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:33
CPC Classifications
B; B41; B41L; B41L5/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1759409A
Cited
US1942409A
Cited
US1954212A
Cited
US1879641A
Cited
US1978973A
Cited
US2106042A
Cited
US2109535A
Cited
US2224609A
Cited
US2209858A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-12-01 | 1951-06-02 | 1951-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-12-01 | 1955-06-02 | 1955-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-12-01 | 1959-06-02 | 1959-12-02 | $7700.00 | Window Closed / Lapsed |