Patent US2797837A successfully refreshed from Google Patents.
US2797837A
Expired / Lapsed
US
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Stopper for ampoules and the like
Assignee: Individual
•
Filing: 1954-04-19
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Granted: 1957-07-02
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Expires: 1974-04-19
Abstract
No abstract record available.
Inventors
- 👤 Roberts Charles Buford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:55
CPC Classifications
B; B65; B65D; B65D47/00; B65D47/04; B65D47/20; B65D47/2018; B65D47/2056; B65D47/2031; B65D51/00; B65D51/002
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB189522755A
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US1244205A
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US1619770A
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US1788795A
Cited
GB387446A
Cited
US2092401A
Cited
US2115035A
Cited
US2608972A
Cited
FR973069A
Cited
US2662669A
Cited
DE876980C
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-01 | 1960-12-31 | 1961-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-01 | 1964-12-31 | 1965-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-01 | 1968-12-31 | 1969-07-02 | $7700.00 | Window Closed / Lapsed |