Patent US2920638A successfully refreshed from Google Patents.
US2920638A
Expired / Lapsed
US
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Valved container cap having a frangible disk therein
Assignee: Heckethorn Manufacturing and Supply Co
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Filing: 1956-11-05
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Granted: 1960-01-12
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Expires: 1976-11-05
Abstract
No abstract record available.
Inventors
- 👤 John E Heckethorn
- 👤 Vollertzen Sven Herman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:34
CPC Classifications
F; F16; F16K; F16K17/00; F16K17/02; F16K17/14; F16K17/16; F16K17/162; Y; Y10; Y10T; Y10T137/00; Y10T137/1624; Y10T137/1632; Y10T137/1639; Y10T137/1692; Y10T137/1714; Y10T137/1797; Y10T137/1812
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
BE509789A
Cited
US149050A
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US443873A
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US580118A
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GB189604151A
Cited
US1158420A
Cited
FR624208A
Cited
US2498596A
Cited
US2715908A
Cited
US2796080A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-11 | 1963-07-13 | 1964-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-11 | 1967-07-13 | 1968-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-11 | 1971-07-13 | 1972-01-12 | $7700.00 | Window Closed / Lapsed |