US3033221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Priority valve
Assignee: Frank G Hough Co
•
Filing: 1960-04-29
•
Granted: 1962-05-08
•
Expires: 1980-04-29
Abstract
No abstract record available.
Inventors
- 👤 Don S Strader
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:38
CPC Classifications
F; F15; F15B; F15B11/00; F15B11/16; F15B13/00; F15B13/02; F15B13/022; F16; F16K; F16K31/00; F16K31/12; F16K31/36; F15B2211/00; F15B2211/40; F15B2211/405; F15B2211/40515; F15B2211/40523; F15B2211/4053; F15B2211/415; F15B2211/41527; F15B2211/42; F15B2211/428; F15B2211/45; F15B2211/46; F15B2211/50; F15B2211/505; F15B2211/50509; F15B2211/50518; F15B2211/515; F15B2211/5156; F15B2211/55; F15B2211/555; F15B2211/70; F15B2211/71; F15B2211/78; F15B2211/781; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2514; Y10T137/2521; Y10T137/2524
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2737196A
Cited
USRE24892E
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-05-07 | 1965-11-06 | 1966-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-05-07 | 1969-11-06 | 1970-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-05-07 | 1973-11-06 | 1974-05-08 | $7700.00 | Window Closed / Lapsed |