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US2844643A
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Assignee: Individual
•
Filing: 1952-08-11
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Granted: 1958-07-22
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Expires: 1972-08-11
Abstract
No abstract record available.
Inventors
- 👤 Thomas N Cofer
- 👤 Anton J Borchers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:22
CPC Classifications
E; E04; E04H; E04H12/00; E04H12/02; E04H12/04; E04H12/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US329833A
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US373240A
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US714644A
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US1329492A
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US2040010A
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US1995874A
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US2327581A
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US2308528A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-07-21 | 1962-01-20 | 1962-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-21 | 1966-01-20 | 1966-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-21 | 1970-01-20 | 1970-07-22 | $7700.00 | Window Closed / Lapsed |