Patent US3530958A successfully refreshed from Google Patents.
US3530958A
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Viscosity control means for fluid of hydraulic elevator systems
Assignee: Delaware Capital Formation Inc
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Filing: 1968-08-16
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Granted: 1970-09-29
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Expires: 1988-08-16
Abstract
No abstract record available.
Inventors
- 👤 John E Brannon
- 👤 Louis Conn Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:18
CPC Classifications
F; F15; F15B; F15B21/00; F15B21/04; F15B21/045; B; B66; B66B; B66B1/00; B66B1/24; B66B1/34; B66B1/36; B66B1/40; B66B1/405; D; D01; D01G; D01G1/00; D01G1/06; D01G1/10; Y; Y10; Y10S; Y10S57/00; Y10S57/907; Y10S60/00; Y10S60/911
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2166940A
Cited
US3057160A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-28 | 1974-03-30 | 1974-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-28 | 1978-03-30 | 1978-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-28 | 1982-03-30 | 1982-09-29 | $7700.00 | Window Closed / Lapsed |