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Patent 893944 Summary

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Claims and Abstract availability

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(12) Patent: (11) CA 893944
(21) Application Number: 893944
(54) English Title: SEWAGE TREATMENT
Status: Term Expired - Post Grant Beyond Limit
Bibliographic Data
(51) International Patent Classification (IPC):
  • C02F 1/52 (2006.01)
  • C02F 1/54 (2006.01)
(72) Inventors :
  • DONALD A. NELSON,
(73) Owners :
  • NALCO CHEMICAL COMPANY
(71) Applicants :
  • NALCO CHEMICAL COMPANY (United States of America)
(74) Agent:
(74) Associate agent:
(45) Issued: 1972-02-22
(22) Filed Date:
Availability of licence: N/A
Dedicated to the Public: N/A
(25) Language of filing: English

Patent Cooperation Treaty (PCT): No

(30) Application Priority Data: None

Abstracts

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Claims

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Description

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Representative Drawing

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Administrative Status

2024-08-01:As part of the Next Generation Patents (NGP) transition, the Canadian Patents Database (CPD) now contains a more detailed Event History, which replicates the Event Log of our new back-office solution.

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Event History

Description Date
Inactive: IPC assigned 2004-12-20
Inactive: IPC assigned 2004-12-20
Inactive: Expired (old Act Patent) latest possible expiry date 1989-02-22
Grant by Issuance 1972-02-22

Abandonment History

There is no abandonment history.

Owners on Record

Note: Records showing the ownership history in alphabetical order.

Current Owners on Record
NALCO CHEMICAL COMPANY
Past Owners on Record
DONALD A. NELSON
Past Owners that do not appear in the "Owners on Record" listing will appear in other documentation within the application.
Documents

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Document
Description 		 Date
(yyyy-mm-dd) 		 Number of pages   Size of Image (KB) 
Cover Page 1994-08-26 1 17
Abstract 1994-08-26 1 28
Claims 1994-08-26 1 36
Drawings 1994-08-26 1 18
Descriptions 1994-08-26 11 482