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US3036641A
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Assignee: Johnston Testers Inc
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Filing: 1958-07-03
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Granted: 1962-05-29
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Expires: 1978-07-03
Abstract
No abstract record available.
Inventors
- 👤 Benjamin P Nutter
- 👤 Iii Phil H Griffin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:28
CPC Classifications
E; E21; E21B; E21B23/00; E21B23/06; E21B43/00; E21B43/02; E21B43/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2178540A
Cited
US2365052A
Cited
US2389869A
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US2575105A
Cited
US2808113A
Cited
US2931438A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-05-28 | 1965-11-27 | 1966-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-05-28 | 1969-11-27 | 1970-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-05-28 | 1973-11-27 | 1974-05-29 | $7700.00 | Window Closed / Lapsed |