Patent US3238620A successfully refreshed from Google Patents.
US3238620A
Expired / Lapsed
US
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Method of preparing an impression of a tooth
Assignee: Individual
•
Filing: 1961-06-22
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Granted: 1966-03-08
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Expires: 1981-06-22
Abstract
No abstract record available.
Inventors
- 👤 Lyle C Robertson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:51
CPC Classifications
A; A61; A61C; A61C9/00; A61C9/0033
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2152391A
Cited
US2274814A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-03-07 | 1969-09-06 | 1970-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-07 | 1973-09-06 | 1974-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-07 | 1977-09-06 | 1978-03-08 | $7700.00 | Window Closed / Lapsed |