Patent US2977681A successfully refreshed from Google Patents.
US2977681A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Engraving machine
Assignee: Parker Pen Co
•
Filing: 1958-09-16
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Granted: 1961-04-04
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Expires: 1978-09-16
Abstract
No abstract record available.
Inventors
- 👤 Cadman Corlis Donald
- 👤 Notbohm Elmer William
- 👤 Picha Robert Jerome
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:28
CPC Classifications
B; B44; B44B; B44B3/00; B44B3/001
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US239263A
Cited
US537125A
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US1874046A
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US1900203A
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US2086915A
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US2279073A
Cited
US2565914A
Cited
US2744329A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-03 | 1964-10-03 | 1965-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-03 | 1968-10-03 | 1969-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-03 | 1972-10-03 | 1973-04-04 | $7700.00 | Window Closed / Lapsed |