Patent US3643831A successfully refreshed from Google Patents.
US3643831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Container for light-sensitive particulate solids
Assignee: Individual
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Filing: 1970-01-21
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Granted: 1972-02-22
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Expires: 1990-01-21
Abstract
Abstract A container for light-sensitive particulate solids is generally cylindrical with opaque walls and top. The latter may be of any of the conventional dispensing types. The bottom, however, is of transparent material and is preferably in the form of a clear plastic plug. When stored normally on a shelf, the contents are shielded from light. However, when the container is removed temporarily from its position of rest on a horizontal surface, the contents may be observed through the transparent bottom.
Inventors
- 👤 Lee A Casper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:32
CPC Classifications
B; B65; B65D; B65D81/00; B65D81/24; B65D81/30
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
73 words
In an opaque cylindrical container for light-sensitive particulate solids, a top-mounted opaque dispensing closure which can be changed from a sealing mode to a dispensing mode, and a permanently fixed transparent one-piece bottom closure which, in the normal vertical storage position of the container doEs not allow the entrance of light but which, when the container is tilted, permits observation of the contents thereof across the entire internal cross section of said container.
Claim 2
Dependent Claim
73 words
In an opaque cylindrical container for light-sensitive particulate solids, a top-mounted opaque dispensing closure which can be changed from a sealing mode to a dispensing mode, and a permanently fixed transparent one-piece bottom closure which, in the normal vertical storage position of the container doEs not allow the entrance of light but which, when the container is tilted, permits observation of the contents thereof across the entire internal cross section of said container.
Claim 3
Dependent Claim
72 words
The container of claim 1 wherein said fixed transparent bottom closure is a unitary hollow plug including an integral transparent flat disc, having at least the same diameter as the outside diameter of the container, and a dependent sleeve having an outside diameter approximately equal to the internal diameter of the container, said sleeve being mounted in direct contact with the interior of the container and in frictional engagement with its walls.
Claim 4
Dependent Claim
25 words
The container of claim 2 wherein the frictional engagement of said sleeve portion is increased by providing it with a plurality of external annular barbs.
Claim 5
Dependent Claim
22 words
The container of claim 3 wherein the leading edge of said sleeve portion is beveled to facilitate insertion thereof into said container.
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) | 1975-02-21 | 1975-08-23 | 1976-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-21 | 1979-08-23 | 1980-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-21 | 1983-08-23 | 1984-02-22 | $7700.00 | Window Closed / Lapsed |