US3155109A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid supply apparatus
Assignee: Research Specialties Co
•
Filing: 1961-08-29
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Granted: 1964-11-03
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Expires: 1981-08-29
Abstract
No abstract record available.
Inventors
- 👤 Erik W Anthon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:34
CPC Classifications
B; B01; B01J; B01J4/00; B01J4/001; Y; Y10; Y10T; Y10T137/00; Y10T137/7287; Y10T137/7339; Y10T137/7355; Y10T137/8158; Y10T137/8342
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
APPARATUS FOR MAINTAINING THE LEVEL OF LIQUID IN A CONTAINER IN A FIXED PLANE DURING CHANGES IN THE AMOUNT OF LIQUID PRESENT IN THE CONTAINER, COMPRISING A HOUSING, SUPPORT MEANS HELD VERTICALLY MOVABLE WITHIN SAID HOUSING FOR SUPPORTING THE CONTAINER AND LIQUID CONTENTS, SPRING MEANS PROVIDING THE SOLE VERTICAL SUPPORT FOR SAID SUPPORT MEANS, AND MEANS FOR ADJUSTING THE SPRING CONSTANT OF SAID SPRING MEANS TO PROVIDE A FORCE PER UNIT OF CHANGE IN LENGTH OF THE SPRING MEANS EQUAL TO THE FORCE OF GRAVITY OF THE LIQUID PER UNIT OF DEPTH OF THE LIQUID.
Claim 2
Dependent Claim
95 words
APPARATUS FOR MAINTAINING THE LEVEL OF LIQUID IN A CONTAINER IN A FIXED PLANE DURING CHANGES IN THE AMOUNT OF LIQUID PRESENT IN THE CONTAINER, COMPRISING A HOUSING, SUPPORT MEANS HELD VERTICALLY MOVABLE WITHIN SAID HOUSING FOR SUPPORTING THE CONTAINER AND LIQUID CONTENTS, SPRING MEANS PROVIDING THE SOLE VERTICAL SUPPORT FOR SAID SUPPORT MEANS, AND MEANS FOR ADJUSTING THE SPRING CONSTANT OF SAID SPRING MEANS TO PROVIDE A FORCE PER UNIT OF CHANGE IN LENGTH OF THE SPRING MEANS EQUAL TO THE FORCE OF GRAVITY OF THE LIQUID PER UNIT OF DEPTH OF THE LIQUID.
References Cited (Backward Citations)
US1005780A
Cited
US1023490A
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US1473097A
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US2281444A
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US2716423A
Cited
US2742920A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-11-03 | 1968-05-04 | 1968-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-11-03 | 1972-05-04 | 1972-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-11-03 | 1976-05-04 | 1976-11-03 | $7700.00 | Window Closed / Lapsed |