Patent US3550250A successfully refreshed from Google Patents.
US3550250A
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US
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Assignee: Individual
•
Filing: 1968-02-28
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Granted: 1970-12-29
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Expires: 1988-02-28
Abstract
No abstract record available.
Inventors
- 👤 Joseph J Cervenka
- 👤 Marvin E Hetzel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:02
CPC Classifications
H; H01; H01F; H01F41/00; H01F41/02; H01F41/04; H01F41/10; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49124; Y10T29/4913; Y10T29/49139; Y10T29/49826; Y10T29/49828; Y10T29/51; Y10T29/5136; Y10T29/5137; Y10T29/5142; Y10T29/53; Y10T29/5313; Y10T29/532; Y10T29/53209
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-12-28 | 1974-06-29 | 1974-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-28 | 1978-06-29 | 1978-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-28 | 1982-06-29 | 1982-12-29 | $7700.00 | Window Closed / Lapsed |