Patent US864235A successfully refreshed from Google Patents.
US4094429A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stopper for test tube, and the like
Assignee: Individual
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Filing: 1976-07-26
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Granted: 1978-06-13
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Expires: 1996-07-26
Abstract
Abstract A stopper is provided for a test tube, and the like, which can be quickly inserted into the mouth of the test tube into sealing engagement therewith by a simple pushing operation, and which can be just as quickly removed by a simple pulling operation. The stopper has a hat-like configuration. It is formed of rubber, or equivalent resilient material. The stopper is placed over the mouth of the test tube and is pushed inwardly until it assumes an inside-out configuration in which the stopper is firmly sealed to the mouth of the test tube. To remove the stopper, it is merely necessary to pull it back to its original configuration.
Inventors
- 👤 Matthew C. Urbin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:21
CPC Classifications
B; B65; B65D; B65D39/00; B65D39/04; C; C12; C12M; C12M23/00; C12M23/02; C12M23/08
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
126 words
A stopper for sealing the mouth of a test tube, and the like, said stopper being formed of a resilient material, and having a hat-shape with a closed outer end and an open inter end, and having a peripheral rim surrounding said open inter end and dimensioned to engage the edge surrounding the mouth of the test tube in which the wall of the stopper tapers from a thicker to a thiner dimension from the closed end of the stopper to said peripheral rim and with the central portion of the stopper being adapted to be pushed inwardly into the mouth of the test tube to assume an inside-out configuration in sealing relationship with the inner wall of the test tube adjacent to the aforesaid edge.
Claim 2
Dependent Claim
126 words
A stopper for sealing the mouth of a test tube, and the like, said stopper being formed of a resilient material, and having a hat-shape with a closed outer end and an open inter end, and having a peripheral rim surrounding said open inter end and dimensioned to engage the edge surrounding the mouth of the test tube in which the wall of the stopper tapers from a thicker to a thiner dimension from the closed end of the stopper to said peripheral rim and with the central portion of the stopper being adapted to be pushed inwardly into the mouth of the test tube to assume an inside-out configuration in sealing relationship with the inner wall of the test tube adjacent to the aforesaid edge.
Claim 3
Dependent Claim
16 words
The stopper defined in claim 1, in which the stopper has a generally rectangular longitudinal section.
Claim 4
Dependent Claim
30 words
The stopper defined in claim 1, in which the outer end and rim of the stopper are rigid, and the portion of the wall adjacent to the rim is resilient.
Claim 5
Dependent Claim
23 words
The stopper defined in claim 1, and which includes an elongated, rod-like member attached to said closed outer end and extending outwardly therefrom.
References Cited (Backward Citations)
GB471834A
Cited
US2168734A
Cited
US2372182A
Cited
FR1255886A
Cited
US3244308A
Cited
US3241663A
Cited
US3380610A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-12 | 1981-12-12 | 1982-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-12 | 1985-12-12 | 1986-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-12 | 1989-12-12 | 1990-06-13 | $7700.00 | Window Closed / Lapsed |