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US2738802A
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Liquid level maintenance apparatus
Assignee: Individual
•
Filing: 1953-04-13
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Granted: 1956-03-20
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Expires: 1973-04-13
Abstract
No abstract record available.
Inventors
- 👤 John J Mcgillis
- 👤 Hugh D Mcgillis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:18
CPC Classifications
G; G05; G05D; G05D9/00; G05D9/02; F; F22; F22B; F22B37/00; F22B37/02; F22B37/42; F22B37/428; F22D; F22D5/00; F22D5/26; F22D5/30; Y; Y10; Y10T; Y10T137/00; Y10T137/2931; Y10T137/3115; Y10T137/7287; Y10T137/7498; Y10T137/7501; Y10T137/8593; Y10T137/86493; Y10T137/86558; Y10T137/86566
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-03-20 | 1959-09-19 | 1960-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-20 | 1963-09-19 | 1964-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-20 | 1967-09-19 | 1968-03-20 | $7700.00 | Window Closed / Lapsed |