US3554703A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Analytical step indicator board
Assignee: Individual
•
Filing: 1968-05-29
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Granted: 1971-01-12
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Expires: 1988-05-29
Abstract
Abstract A BOARD FOR INSTRUCTION IN THE PRINCIPLES OF CHEMICAL ANALYSIS AND HAVING A SERIES OF APERATURES LABELLED WITH INSTRUCTIONS AND ARRANGED IN GROUPS TO DEFINE THE VARIOUS STAGES OF THE ANALYSIS. IN A PREFERRED EMBODIMENT, THE INSTRUCTIONS ARE PROVIDED ON A WASHABLE CARD APERTURED SIMILARLY TO THE BOARD AND REMOVABLE THEREFROM SO AS TO ENABLE THE CARD TO BE CHANGED OR TO ENABLE THE BOARD TO BE USED WITHOUT THE INSTRUCTIONS.
Inventors
- 👤 Graham William Moss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:32
CPC Classifications
B; B01; B01L; B01L99/00; G; G01; G01N; G01N31/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |