CA1020151A - Upward tunneling - Google Patents

Upward tunneling

Info

Publication number: CA1020151A
Authority: CA; Canada
Prior art keywords: tunneling; upward; upward tunneling
Prior art date: 1972-11-13
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.): Expired

Application number

CA252,342A

Inventor

Clayton H. Crane

Tyman H. Fikse

Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

Robbins Co

Original Assignee

Robbins Co

Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)

1972-11-13

Filing date

1976-05-12

Publication date

1977-11-01

1972-11-13 Priority claimed from US00305912A external-priority patent/US3840272A/en

1976-05-12 Application filed by Robbins Co filed Critical Robbins Co

1976-05-12 Priority to CA252,342A priority Critical patent/CA1020151A/en

1977-11-01 Application granted granted Critical

1977-11-01 Publication of CA1020151A publication Critical patent/CA1020151A/en

Status Expired legal-status Critical Current

Links

CA252,342A 1972-11-13 1976-05-12 Upward tunneling Expired CA1020151A (en)

Priority Applications (1)

Application Number	Priority Date	Filing Date	Title
CA252,342A CA1020151A (en)	1972-11-13	1976-05-12	Upward tunneling

Applications Claiming Priority (3)

Application Number	Priority Date	Filing Date	Title
US00305912A US3840272A (en)	1972-11-13	1972-11-13	Upward tunneling
CA185,548A CA999845A (en)	1972-11-13	1973-11-09	Upward tunneling
CA252,342A CA1020151A (en)	1972-11-13	1976-05-12	Upward tunneling

Publications (1)

Publication Number	Publication Date
CA1020151A true CA1020151A (en)	1977-11-01

Family

ID=27163161

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
CA252,342A Expired CA1020151A (en)	1972-11-13	1976-05-12	Upward tunneling

Country Status (1)

Country	Link
CA (1)	CA1020151A (en)

1976
- 1976-05-12 CA CA252,342A patent/CA1020151A/en not_active Expired

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Legal Events

Date	Code	Title	Description
2023-09-23	MKEX	Expiry	Effective date: 19941101