Patent US3151402A successfully refreshed from Google Patents.
US3151402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surveying apparatus for mine shafts
Assignee: Individual
•
Filing: 1961-12-29
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Granted: 1964-10-06
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Expires: 1981-12-29
Abstract
No abstract record available.
Inventors
- 👤 Ivan O Gelgessen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:30
CPC Classifications
G; G01; G01C; G01C15/00; G01C15/10
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
147 words
A SURVEYING APPARATUS FOR MINE SHAFTS OF THE CHARACTER DESCRIBED, COMPRISING A PLURALITY OF ALUMINUM AND PLASTIC TUBULAR SECTIONS, TELESCOPED ONE INTO THE OTHER, THE SAID SECTIONS HAVING THEIR EDGES RESTING ON A FLAT RUBBER RING THEREBY SEALING THE SAID SECTIONS INTO ONE CONTINUOUS TUBULAR STRUCTURE WHEN ASSEMBLED, A PLURALITY OF LOCKING MECHANISMS ON THE SIDES OF THE SAID TUBULAR SECTIONS LOCKING THE SAID TUBULAR SECTIONS TOGETHER, MECHANISM GIVING VERTICAL ADJUSTMENT TO THE SAID SECTIONS AND A BELLOWS CONNECTED TO AND INSERTED BETWEEN TWO OF THE SAID SECTIONS THEREBY PROVIDING ADDITIONAL VERTICAL ADJUSTMENT TO THE SAID INSTRUMENT AND MECHANISM PRESSING THE SOFT RUBBER RING TOP OF THE SAID INSTRUMENT AGAINST THE UNDERSIDE OF 807 O.G.--4 THE CEILING OF A MINE SHAFT AND THE BOTTOM SECTION OF THE SAID TUBULAR SECTIONS HAVING A SHARPENED LOWER EDGE THAT PRESSES INTO THE BOTTOM OF THE SAID SHAFT AND A PLUMB
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-10-06 | 1968-04-06 | 1968-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-10-06 | 1972-04-06 | 1972-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-10-06 | 1976-04-06 | 1976-10-06 | $7700.00 | Window Closed / Lapsed |