Patent US2939430A successfully refreshed from Google Patents.
Patent US3034500A successfully refreshed from Google Patents.
US3034500A
Expired / Lapsed
US
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Method and apparatus for measuring and recording group reactions
Assignee: Individual
•
Filing: 1957-05-02
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Granted: 1962-05-15
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Expires: 1977-05-02
Abstract
No abstract record available.
Inventors
- 👤 Jr Grover C Backster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:43
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/05; A61B5/053; A61B5/0531; A61B5/0533
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1990489A
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US2096109A
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US2412363A
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US2400583A
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US2452799A
Cited
US2657683A
Cited
US2688872A
Cited
US2684670A
Cited
US2712976A
Cited
US2712309A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-05-14 | 1965-11-13 | 1966-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-05-14 | 1969-11-13 | 1970-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-05-14 | 1973-11-13 | 1974-05-15 | $7700.00 | Window Closed / Lapsed |