US2525372A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gulley emptying apparatus incorporating a vacuum chamber
Assignee: Individual
•
Filing: 1948-02-24
•
Granted: 1950-10-10
•
Expires: 1968-02-24
Abstract
No abstract record available.
Inventors
- 👤 Leonard H Riddell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:15
CPC Classifications
E; E03; E03F; E03F7/00; E03F7/10; E03F7/103
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US351783A
Cited
US1316851A
Cited
USRE21277E
Cited
US1561744A
Cited
GB259403A
Cited
US2132727A
Cited
US2259966A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-10-09 | 1954-04-10 | 1954-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-09 | 1958-04-10 | 1958-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-09 | 1962-04-10 | 1962-10-10 | $7700.00 | Window Closed / Lapsed |