Patent US3285354A successfully refreshed from Google Patents.
US3285354A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Core retainer having curved gates
Assignee: Individual
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Filing: 1963-12-26
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Granted: 1966-11-15
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Expires: 1983-12-26
Abstract
No abstract record available.
Inventors
- 👤 John E Sanders
- 👤 Adrian A Disco
- 👤 Anthony L Massini
- 👤 Johnson Donald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:46
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/10; E21B25/00; E21B25/10; E21B25/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
A CORE RETAINER COMPRISING A CUTTING HEAD HAVING AN UPPER END, A COLLAR HAVING A LOWER END, A HOLLOW BODY HAVING AN UPPER AND LOWER OPEN END, SAID UPPER END OF SAID BODY SECURED TO SAID LOWER END OF SAID COLLAR AND SAID LOWER END OF SAID BODY SECURED TO SAID UPPER END OF SAID CUTTING HEAD, SAID BODY HAVING A LOWER END PORTION PROVIDED WITH TWO OPPOSED OPENINGS, A PAIR OF OPPOSEED CURVED GATES PIVOTALLY SECURED TO SAID LOWER END OF BODY ADJACENT SAID OPENINGS, A SLEEVE SLIDABLY FITTED AROUND SAID BODY AND OVER SAID OPENINGS, AND A PAIR OF ELONGATED LEVERS,
Claim 2
Dependent Claim
103 words
A CORE RETAINER COMPRISING A CUTTING HEAD HAVING AN UPPER END, A COLLAR HAVING A LOWER END, A HOLLOW BODY HAVING AN UPPER AND LOWER OPEN END, SAID UPPER END OF SAID BODY SECURED TO SAID LOWER END OF SAID COLLAR AND SAID LOWER END OF SAID BODY SECURED TO SAID UPPER END OF SAID CUTTING HEAD, SAID BODY HAVING A LOWER END PORTION PROVIDED WITH TWO OPPOSED OPENINGS, A PAIR OF OPPOSEED CURVED GATES PIVOTALLY SECURED TO SAID LOWER END OF BODY ADJACENT SAID OPENINGS, A SLEEVE SLIDABLY FITTED AROUND SAID BODY AND OVER SAID OPENINGS, AND A PAIR OF ELONGATED LEVERS,
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-11-14 | 1970-05-16 | 1970-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-14 | 1974-05-16 | 1974-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-14 | 1978-05-16 | 1978-11-15 | $7700.00 | Window Closed / Lapsed |