US3572997A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Soil testing kit
Assignee: Burk Industries Inc
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Filing: 1968-05-24
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Granted: 1971-03-30
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Expires: 1988-05-24
Abstract
Abstract A SOIL TESTING KIT IN WHICH AN ENVELOPE CONTAINING WATER TOGETHER WITH AN ENVELOPE CONTAINING A TEST PAPER ARE PACKAGED IN THE BOTTOM FOLD OF A MATCHBOOK PACKAGE. THE WATER-CONTAINING ENVELOPE IS STIFFENED THROUGH HEAT SEALING SO THAT IT MAY BE SUPPORTED VERTICALLY TO ACT AS A MIXING CONTAINER.
Inventors
- 👤 Robert E Burk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:53
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/24
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) | 1974-03-29 | 1974-09-28 | 1975-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-29 | 1978-09-28 | 1979-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-29 | 1982-09-28 | 1983-03-30 | $7700.00 | Window Closed / Lapsed |