Patent US2819692A successfully refreshed from Google Patents.
US2819692A
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Assignee: Individual
•
Filing: 1956-03-21
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Granted: 1958-01-14
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Expires: 1976-03-21
Abstract
No abstract record available.
Inventors
- 👤 David B Johnson
- 👤 Leslie N Knutson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:54
CPC Classifications
E; E05; E05G; E05G1/00; E05G1/02; E05G2700/00; E05G2700/02; Y; Y10; Y10T; Y10T70/00; Y10T70/50; Y10T70/5093; Y10T70/5155; Y10T70/5199; Y10T70/5246; Y10T70/5248; Y10T70/5252; Y10T70/5261; Y10T70/554; Y10T70/5562; Y10T70/5575; Y10T70/558; Y10T70/5584
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-13 | 1961-07-15 | 1962-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-13 | 1965-07-15 | 1966-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-13 | 1969-07-15 | 1970-01-14 | $7700.00 | Window Closed / Lapsed |