Patent US3473779A successfully refreshed from Google Patents.
US3473779A
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Flexible tube valve having positive opening and closing means
Assignee: HENRY E GUSTAFSON
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Filing: 1965-04-12
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Granted: 1969-10-21
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Expires: 1985-04-12
Abstract
No abstract record available.
Inventors
- 👤 Henry E Gustafson
- 👤 Harold L Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:27
CPC Classifications
A; A47; A47K; A47K11/00; A47K11/02; A47K11/026; F; F04; F04B; F04B53/00; F04B53/22; F16; F16K; F16K31/00; F16K31/44; F16K31/52; F16K31/524; F16K31/52491; F16K7/00; F16K7/02; F16K7/04; F16K7/06; Y; Y02; Y02A; Y02A50/00; Y02A50/30
Claims Analysis
Total Claims: 0
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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) | 1972-10-20 | 1973-04-21 | 1973-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-20 | 1977-04-21 | 1977-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-20 | 1981-04-21 | 1981-10-21 | $7700.00 | Window Closed / Lapsed |