US3434729A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ram assembly
Assignee: Shaffer Tool Works
•
Filing: 1965-10-21
•
Granted: 1969-03-25
•
Expires: 1985-10-21
Abstract
No abstract record available.
Inventors
- 👤 Donald U Shaffer
- 👤 John A Vertson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:54
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/06; E21B33/061; E21B33/062; Y; Y10; Y10T; Y10T137/00; Y10T137/598; Y10T137/5983
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1861614A
Cited
US1967417A
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US1963683A
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US2060248A
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US2194255A
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US2246709A
Cited
US2604903A
Cited
US2690320A
Cited
US2912214A
Cited
US3132662A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-03-24 | 1972-09-23 | 1973-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-24 | 1976-09-23 | 1977-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-24 | 1980-09-23 | 1981-03-25 | $7700.00 | Window Closed / Lapsed |