Patent US3439581A successfully refreshed from Google Patents.
US3439581A
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Slide unit
Assignee: RESEARCH DESIGNING SERVICES Inc
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Filing: 1966-08-15
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Granted: 1969-04-22
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Expires: 1986-08-15
Abstract
No abstract record available.
Inventors
- 👤 Howard W Wilkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:04
CPC Classifications
B; B23; B23Q; B23Q11/00; B23Q11/12; B23Q11/121; B23Q11/124; B23Q1/00; B23Q1/25; B23Q1/26; B23Q1/262; B23Q1/44; B23Q1/56; B23Q1/58; B23Q5/00; B23Q5/22; B23Q5/26; Y; Y10; Y10T; Y10T408/00; Y10T408/65; Y10T408/675; Y10T408/6757
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2172595A
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US1929484A
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US2012493A
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US2233571A
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US2148348A
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US2324727A
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US2588937A
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US2860487A
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US3060466A
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US3083592A
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US3224341A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-21 | 1972-10-21 | 1973-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-21 | 1976-10-21 | 1977-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-21 | 1980-10-21 | 1981-04-22 | $7700.00 | Window Closed / Lapsed |