US3373572A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of driving tunnels
Assignee: Individual
•
Filing: 1965-10-12
•
Granted: 1968-03-19
•
Expires: 1985-10-12
Abstract
No abstract record available.
Inventors
- 👤 Maxwell F Kemper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:49
CPC Classifications
E; E21; E21D; E21D9/00; E21D9/06; E21D9/0642; E21D9/065
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
148 words
A METHOD OF DRIVING AN ELONGATE, ARCHED SHIELD INTO THE GROUND IN THE FORMATION OF A TUNNEL COMPRISING: POSITIONING THE SHIELD SO THAT ONE END THEREOF MAY BE PROGRESSIVELY DRIVEN INTO THE GROUND; PROVIDING ON EACH SIDE OF THE LONGITUDINAL CENTER LINE OF THE SHIELD AND ADJACENT SAID END AND EACH SIDE OF THE SHIELD A PLURALITY OF SUPPORTS IN CONTACT WITH THE GROUND AND WITH THE UPPER PORTION OF THE INTERIOR OF THE SHIELD AT LONGITUDINALLY SPACED LOCATIONS ON THE SHIELD; APPLYING A FORCE FOR MOVING SAID SHIELD LONGITUDINALLY RELATIVE TO SAID SUPPORTS TO ADVANCE THE SHIELD INTO THE GROUND; REMOVING THE SUPPORTS ONE AT A TIME FROM CONTACT WITH THE GROUND: MOVING EACH SUPPORT LONGITUDINALLY OF THE SHIELD TO A NEW POSITION WHEN FREE OF THE GROUND WHILE OTHER OF SAID SUPPORTS ON OPPOSITE SIDES OF SAID CENTER LINE REMAIN IN CONTACT WITH THE GROUND; AND
Claim 2
Independent Claim
148 words
A METHOD OF DRIVING AN ELONGATE, ARCHED SHIELD INTO THE GROUND IN THE FORMATION OF A TUNNEL COMPRISING: POSITIONING THE SHIELD SO THAT ONE END THEREOF MAY BE PROGRESSIVELY DRIVEN INTO THE GROUND; PROVIDING ON EACH SIDE OF THE LONGITUDINAL CENTER LINE OF THE SHIELD AND ADJACENT SAID END AND EACH SIDE OF THE SHIELD A PLURALITY OF SUPPORTS IN CONTACT WITH THE GROUND AND WITH THE UPPER PORTION OF THE INTERIOR OF THE SHIELD AT LONGITUDINALLY SPACED LOCATIONS ON THE SHIELD; APPLYING A FORCE FOR MOVING SAID SHIELD LONGITUDINALLY RELATIVE TO SAID SUPPORTS TO ADVANCE THE SHIELD INTO THE GROUND; REMOVING THE SUPPORTS ONE AT A TIME FROM CONTACT WITH THE GROUND: MOVING EACH SUPPORT LONGITUDINALLY OF THE SHIELD TO A NEW POSITION WHEN FREE OF THE GROUND WHILE OTHER OF SAID SUPPORTS ON OPPOSITE SIDES OF SAID CENTER LINE REMAIN IN CONTACT WITH THE GROUND; AND
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) | 1971-03-19 | 1971-09-18 | 1972-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-19 | 1975-09-18 | 1976-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-19 | 1979-09-18 | 1980-03-19 | $7700.00 | Window Closed / Lapsed |