Patent US2820376A successfully refreshed from Google Patents.
US2820376A
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Boring machine
Assignee: Greenlee Brothers and Co
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Filing: 1954-07-01
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Granted: 1958-01-21
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Expires: 1974-07-01
Abstract
No abstract record available.
Inventors
- 👤 Joel A Janncnga
- 👤 Donald E Hawkinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:22
CPC Classifications
B; B23; B23B; B23B29/00; B23B29/03; B23B29/034; B23B29/03432; B23B29/03478; B23Q; B23Q1/00; B23Q1/25; B23Q1/44; B23Q1/50; B23Q1/54; B23Q1/5468; Y; Y10; Y10T; Y10T408/00; Y10T408/83; Y10T408/85; Y10T408/854; Y10T408/855; Y10T74/00; Y10T74/18; Y10T74/18056; Y10T74/18296; Y10T74/18336; Y10T82/00; Y10T82/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2303300A
Cited
FR993914A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-20 | 1961-07-22 | 1962-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-20 | 1965-07-22 | 1966-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-20 | 1969-07-22 | 1970-01-21 | $7700.00 | Window Closed / Lapsed |