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Patent US3513812A successfully refreshed from Google Patents.
US3513812A
Expired / Lapsed
US
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Self-locking livestock head gate structure
Assignee: DAVID H IVERSON
•
Filing: 1968-08-01
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Granted: 1970-05-26
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Expires: 1988-08-01
Abstract
No abstract record available.
Inventors
- 👤 David H Iverson
- 👤 Dayton A Krueger
- 👤 James R Krueger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:16
CPC Classifications
A; A01; A01K; A01K1/00; A01K1/06; A01K1/0613; A61; A61D; A61D3/00; A61D2003/003
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1513336A
Cited
US3043269A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-05-25 | 1973-11-24 | 1974-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-25 | 1977-11-24 | 1978-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-25 | 1981-11-24 | 1982-05-26 | $7700.00 | Window Closed / Lapsed |