US3441999A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for making tapered spring leaf blanks and the like
Assignee: Boeing North American Inc
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Filing: 1966-09-12
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Granted: 1969-05-06
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Expires: 1986-09-12
Abstract
No abstract record available.
Inventors
- 👤 Willard F Perdue
- 👤 Howard O Collins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:00
CPC Classifications
F; F16; F16F; F16F1/00; F16F1/02; B; B21; B21D; B21D53/00; B21D53/88; B21D53/886; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49609; Y10T29/49611; Y10T29/49789; Y10T29/49794
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2085112A
Cited
US2288026A
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US2633626A
Cited
US3238072A
Cited
US3339908A
Cited
US3345727A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-05 | 1972-11-04 | 1973-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-05 | 1976-11-04 | 1977-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-05 | 1980-11-04 | 1981-05-06 | $7700.00 | Window Closed / Lapsed |