Patent US4334028A successfully refreshed from Google Patents.
US4334028A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flask
Assignee: Individual
•
Filing: 1981-01-02
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Granted: 1982-06-08
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Expires: 2001-01-02
Abstract
Abstract In a flask suitable for tissue or micro-organism culture, having top and bottom walls, a pair of similar side walls, a closed end wall, a second end wall having an opening therein, a tubular open neck in sealing engaged at one end with the second end wall so as to surround the opening therein, and means for sealing the other end of the neck, the improvement which comprises a frangible zone formed on the top wall for access to the interior of the culture flask.
Inventors
- 👤 Joseph L. Carver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:43
CPC Classifications
C; C12; C12M; C12M23/00; C12M23/32; C12M23/02; C12M23/08
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
86 words
In a flask suitable for tissue or micro-organism culture, having top and bottom walls, a pair of similar side walls, a closed end wall, a second end wall having an opening therein, a tubular open neck in sealing engagement at one end with the second end wall so as to surround the opening therein, and means for sealing the other end of the neck, the improvement which comprises a frangible zone integrally formed in the top wall for access to the interior of the culture flask.
Claim 2
Dependent Claim
86 words
In a flask suitable for tissue or micro-organism culture, having top and bottom walls, a pair of similar side walls, a closed end wall, a second end wall having an opening therein, a tubular open neck in sealing engagement at one end with the second end wall so as to surround the opening therein, and means for sealing the other end of the neck, the improvement which comprises a frangible zone integrally formed in the top wall for access to the interior of the culture flask.
Claim 3
Dependent Claim
33 words
The culture flask of claim 1 wherein the frangible zone is demarked by a linear reduction in the thickness of the top wall along which the top wall may be cut or broken.
Claim 4
Dependent Claim
32 words
The culture flask of claim 2 wherein one portion of the linear reduction in thickness is of greater thickness than the remainder so as to form a hinge for the frangible zone.
Claim 5
Dependent Claim
42 words
The culture flask of claim 2 wherein one portion of the linear reduction in thickness is of greater width than the remainder so as to form an area for the initiation of breaking of the frangible zone away from the top wall.
References Cited (Backward Citations)
US824210A
Cited
US1451055A
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US3449210A
Cited
US3732999A
Cited
US3726764A
Cited
US3870602A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-06-07 | 1985-12-07 | 1986-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-07 | 1989-12-07 | 1990-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-07 | 1993-12-07 | 1994-06-08 | $7700.00 | Window Closed / Lapsed |