US3259247A
Expired / Lapsed
US
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Assignee: Walker Manufacturing Co
•
Filing: 1963-01-15
•
Granted: 1966-07-05
•
Expires: 1983-01-15
Abstract
No abstract record available.
Inventors
- 👤 La Vern R Tietz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:16
CPC Classifications
F; F01; F01M; F01M11/00; F01M11/03; B; B01; B01D; B01D29/00; B01D29/11; B01D29/13; B01D29/15; B01D29/88; B01D35/00; B01D35/14; B01D35/147
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2076935A
Cited
US2430713A
Cited
US2543165A
Cited
US2522565A
Cited
US2897966A
Cited
US2884133A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-07-04 | 1970-01-03 | 1970-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-04 | 1974-01-03 | 1974-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-04 | 1978-01-03 | 1978-07-05 | $7700.00 | Window Closed / Lapsed |