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US3500506A
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Assignee: Individual
•
Filing: 1967-08-28
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Granted: 1970-03-17
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Expires: 1987-08-28
Abstract
No abstract record available.
Inventors
- 👤 David B Mitchell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:59
CPC Classifications
A; A47; A47C; A47C31/00; A47C31/02; A47C31/026; A44; A44B; A44B1/00; A44B1/08; A44B1/12; Y; Y10; Y10T; Y10T24/00; Y10T24/36; Y10T24/3632; Y10T24/3645; Y10T24/367
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1867041A
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US1984743A
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US2223594A
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DE735240C
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US2602975A
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DE850474C
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DE885493C
Cited
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Cited
US3268964A
Cited
US3408105A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-16 | 1973-09-15 | 1974-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-16 | 1977-09-15 | 1978-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-16 | 1981-09-15 | 1982-03-17 | $7700.00 | Window Closed / Lapsed |