US2671428A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum actuated door control for milking barns
Assignee: Individual
•
Filing: 1950-07-03
•
Granted: 1954-03-09
•
Expires: 1970-07-03
Abstract
No abstract record available.
Inventors
- 👤 Henry H Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:09
CPC Classifications
A; A01; A01K; A01K1/00; A01K1/0005; A01K1/0017; E; E05; E05F; E05F15/00; E05F15/50; E05F15/56; E05Y; E05Y2900/00; E05Y2900/10; E05Y2900/13; E05Y2900/132; E05Y2900/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US716783A
Cited
US1217053A
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US1919864A
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US2081947A
Cited
US2194747A
Cited
US2305259A
Cited
US2314429A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-03-08 | 1957-09-07 | 1958-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-08 | 1961-09-07 | 1962-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-08 | 1965-09-07 | 1966-03-09 | $7700.00 | Window Closed / Lapsed |