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US2863180A
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Assignee: Individual
•
Filing: 1957-01-30
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Granted: 1958-12-09
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Expires: 1977-01-30
Abstract
No abstract record available.
Inventors
- 👤 Benjamin F Birdwell
- 👤 Will A Schwehr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:00
CPC Classifications
E; E06; E06B; E06B1/00; E06B1/02; E04; E04B; E04B2/00; E04B2/88; E04B2/90; E06B1/56; E06B1/60; E06B1/6046; E06B1/6053; E06B3/00; E06B3/54; E06B3/58; E06B3/60
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2077808A
Cited
US2793723A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-08 | 1962-06-09 | 1962-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-08 | 1966-06-09 | 1966-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-08 | 1970-06-09 | 1970-12-09 | $7700.00 | Window Closed / Lapsed |