Patent US3872935A successfully refreshed from Google Patents.
US3872935A
Expired / Lapsed
US
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Apparatus and method for obtaining undisturbed soil core samples
Assignee: United States Department of Agriculture
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Filing: 1974-04-30
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Granted: 1975-03-25
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Expires: 1994-04-30
Abstract
Abstract Large-diameter, undisturbed soil core samples were obtained from a variety of soils. Handling and fracturing of the undisturbed soil cores were minimized by encasing the cores in heatshrinkable plastic tubes during sampling operations.
Inventors
- 👤 Lloyd N Mielke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:30
CPC Classifications
E; E21; E21B; E21B25/00; E21B25/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
In a method of obtaining undisturbed soil core samples of the type which utilizes a soil core sampler comprising a cylindrical tube or sampler body, open at both ends, and having at one end thereof a cutting tip which is sharpened for facilitating entry into the soil, an improvement comprising the steps of: a. lining the inside surface of a soil core sampler with a flexible heat-shrinkable plastic tube; b. securing said heat-shrinkable plastic tube to the inner wall near the cutting tip end of said soil core sampler; c. pressing the lined soil core sampler into the ground; d. removing the soil sampler from the ground; and e. heating said heat-shrinkable plastic tube evenly on all sides at a temperature sufficient to cause shrinkage.
Claim 2
Dependent Claim
125 words
In a method of obtaining undisturbed soil core samples of the type which utilizes a soil core sampler comprising a cylindrical tube or sampler body, open at both ends, and having at one end thereof a cutting tip which is sharpened for facilitating entry into the soil, an improvement comprising the steps of: a. lining the inside surface of a soil core sampler with a flexible heat-shrinkable plastic tube; b. securing said heat-shrinkable plastic tube to the inner wall near the cutting tip end of said soil core sampler; c. pressing the lined soil core sampler into the ground; d. removing the soil sampler from the ground; and e. heating said heat-shrinkable plastic tube evenly on all sides at a temperature sufficient to cause shrinkage.
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) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |