Patent US3020892A successfully refreshed from Google Patents.
US3020892A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Constant flow valve assembly
Assignee: Dover Corp
•
Filing: 1959-11-04
•
Granted: 1962-02-13
•
Expires: 1979-11-04
Abstract
No abstract record available.
Inventors
- 👤 Duane J Arbogast
- 👤 Lawrence F Jaseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:02
CPC Classifications
B; B66; B66B; B66B1/00; B66B1/24; B66B1/34; B66B1/36; B66B1/40; B66B1/405; F; F16; F16K; F16K47/00; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7781; Y10T137/7784; Y10T137/7787; Y10T137/7791
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1904475A
Cited
US2560948A
Cited
US1725374A
Cited
US2785660A
Cited
US2782598A
Cited
US2925066A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-02-12 | 1965-08-14 | 1966-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-12 | 1969-08-14 | 1970-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-12 | 1973-08-14 | 1974-02-13 | $7700.00 | Window Closed / Lapsed |