US3404903A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sand discharge pipe connection
Assignee: Roanoke College
•
Filing: 1966-03-15
•
Granted: 1968-10-08
•
Expires: 1986-03-15
Abstract
No abstract record available.
Inventors
- 👤 Virgil L Frantz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:22
CPC Classifications
B; B61; B61C; B61C15/00; B61C15/08; B61C15/10; F; F16; F16L; F16L23/00; F16L23/02; F16L23/036; F16L37/00; F16L37/24; F16L37/244; F16L37/252; Y; Y10; Y10S; Y10S411/00; Y10S411/999
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1572781A
Cited
US1233170A
Cited
AT94368B
Cited
GB140352A
Cited
US1956683A
Cited
US1956794A
Cited
US2018346A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-10-08 | 1972-04-08 | 1972-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-08 | 1976-04-08 | 1976-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-08 | 1980-04-08 | 1980-10-08 | $7700.00 | Window Closed / Lapsed |