US3108636A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for fracturing underground earth formations
Assignee: Pacific Natural Gas Exploration Co
•
Filing: 1961-05-01
•
Granted: 1963-10-29
•
Expires: 1981-05-01
Abstract
No abstract record available.
Inventors
- 👤 Victor E Peterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:07
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/25; E21B43/26; E21B43/2605
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
33 words
A METHOD OF FRACTURING AN UNDERGROUND EARTH FORMATION INTO WHICH A WELL HAS BEEN DRIVEN, COMPRISING PUMPING LIQUID CARBON DIOXIDE INTO SAID EARTH FORMATION AS SUFFICIENT RATE AND PRESSURE TO FRACTURE IT; VOLATILIZING
References Cited (Backward Citations)
US2879847A
Cited
US2772737A
Cited
US2876839A
Cited
US2884067A
Cited
US2869643A
Cited
US2955654A
Cited
US3063499A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-10-28 | 1967-04-29 | 1967-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-10-28 | 1971-04-29 | 1971-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-10-28 | 1975-04-29 | 1975-10-29 | $7700.00 | Window Closed / Lapsed |