US3226855A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Earth digging and trenching screw
Assignee: Individual
•
Filing: 1963-03-27
•
Granted: 1966-01-04
•
Expires: 1983-03-27
Abstract
No abstract record available.
Inventors
- 👤 Opton F Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:10
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/06; E02F9/00; E02F9/28; E02F9/2866
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
98 words
IN A SCREW, A DOUBLE SCREW FLIGHT CAPABLE OF ROTATION, A PLURALITY OF TEETH FORMED INTEGRALLY ON THE OUTER PERIPHERY OF EACH SCREW FLIGHT WITH EACH TOOTH LYING SUBSTANTIALLY IN THE PLANE OF THE FLIGHT, THE RADIALLY OUTER EDGE OF EACH TOOTH LYING SUBSTANTIALLY ON A CIRCUMFERENCE WITH RELATION TO THE DOUBLE SCREW FLIGHT, THE FRONT EDGE OF EACH TOOTH SLANTING FROM THE RADIALLY INNER EDGE THEREOF AWAY FROM THE DIRECTION OF ROTATION BACKWARDLY AND OUTWARDLY FROM A RADIUS OF THE DOUBLE SCREW FLIGHT, AND SAID FRONT EDGE BEING FORMED WITH A BEVEL TERMINATING IN A CUTTING EDGE.
References Cited (Backward Citations)
US530687A
Cited
US3128998A
Cited
US814982A
Cited
US1368189A
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US1642958A
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US2201159A
Cited
US2381689A
Cited
US2417313A
Cited
US2555358A
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US2610739A
Cited
US2967701A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-03 | 1969-07-05 | 1970-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-03 | 1973-07-05 | 1974-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-03 | 1977-07-05 | 1978-01-04 | $7700.00 | Window Closed / Lapsed |