Patent US2947320A successfully refreshed from Google Patents.
US2947320A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Convertible valve structure
Assignee: ROBOTYPER Corp
•
Filing: 1954-11-08
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Granted: 1960-08-02
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Expires: 1974-11-08
Abstract
No abstract record available.
Inventors
- 👤 Le Roy V Oxley
- 👤 Clarence M Blythe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:15
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/12; F16K31/126; Y; Y10; Y10T; Y10T137/00; Y10T137/5109; Y10T137/5283; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/8667; Y10T29/00; Y10T29/49; Y10T29/49405; Y10T29/49412
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US678872A
Cited
US2295111A
Cited
US2498396A
Cited
US2679172A
Cited
US2747611A
Cited
US2807280A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-02 | 1964-02-01 | 1964-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-02 | 1968-02-01 | 1968-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-02 | 1972-02-01 | 1972-08-02 | $7700.00 | Window Closed / Lapsed |