US3531257A
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Method and apparatus for measuring volume variation in chemical,physiological and biochemical systems
Assignee: DONALD F KNOWLES
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Filing: 1964-08-05
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Granted: 1970-09-29
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Expires: 1984-08-05
Abstract
No abstract record available.
Inventors
- 👤 William R Harvey
- 👤 Donald F Knowles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:38
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/08; A61B5/0803; A61B5/083; A61B5/0833; G; G01; G01F; G01F1/00; G01F17/00; Y; Y10; Y10T; Y10T436/00; Y10T436/12; Y10T436/20; Y10T436/207497; Y10T436/209163
Claims Analysis
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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) | 1973-09-28 | 1974-03-30 | 1974-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-28 | 1978-03-30 | 1978-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-28 | 1982-03-30 | 1982-09-29 | $7700.00 | Window Closed / Lapsed |